All Plus Tools

A growing collection of small, focused web tools — fast, privacy-respecting, and free.

• Collapsible JSON Formatter — Pretty-print JSON in colors with collapsible nodes and per-level controls.
• Regex Tester — Write a regex, see matches highlighted in real-time with capture groups.
• Base64 Encoder / Decoder — Encode or decode text and files to Base64 — standard or URL-safe.
• UUID Generator — Generate cryptographically random v4 UUIDs in bulk with click-to-copy.
• Hash Generator — Compute SHA-1, SHA-256, SHA-384, SHA-512 hashes of text or files.
• Diff Viewer — Paste two texts side by side and see a colored line-by-line diff.
• QR Code Generator — Generate QR codes from text or URLs with custom colors, sizes, and error correction.
• Image Compressor — Compress and resize images in your browser. Adjust quality and export as JPEG, PNG, or WebP.
• Deep Link Tester — Test deep links and custom URL schemes. Get a clickable link and QR code to open on any device.
• Color Converter — Convert between HEX, RGB, and HSL. Visual picker and WCAG contrast checker.
• Lorem Ipsum Generator — Generate placeholder text in paragraphs, sentences, or words. Copy with one click.
• Timestamp Converter — Convert Unix timestamps to dates and back. Live clock, relative time, ISO 8601.
• JWT Decoder — Decode JSON Web Tokens to inspect header, payload, and expiration. No secret needed.
• URL Encoder / Decoder — Encode/decode URL components and parse full URLs into protocol, host, path, and params.
• Markdown Preview — Write Markdown and see a live rendered preview side by side.
• CSS Minifier — Minify CSS by removing whitespace, comments, and redundant semicolons.
• JSON ↔ YAML — Convert between JSON and YAML formats instantly.
• Cron Expression Parser — Parse cron expressions into human-readable schedules with next run times.
• Password Generator — Generate strong, random passwords with customizable length and character sets.
• Text Case Converter — Convert text between camelCase, snake_case, kebab-case, UPPER, Title Case, and more.
• HTML Entity Encoder — Encode and decode HTML entities for special characters like <, >, &, and quotes.
• JSON Path Finder — Find paths to values in JSON documents. Query with dot-notation and browse all paths.
• Number Base Converter — Convert numbers between binary, octal, decimal, and hexadecimal.
• Word Counter — Count words, characters, sentences, paragraphs, and estimate reading time.
• SQL Formatter — Format and beautify SQL queries with proper indentation and keyword uppercasing.
• Chmod Calculator — Calculate Unix file permissions interactively with checkboxes and octal input.
• HTTP Status Codes — Quick reference for HTTP status codes with descriptions. Search by code or name.
• Aspect Ratio Calculator — Calculate aspect ratios, scale dimensions proportionally, and find equivalent resolutions.
• CSV ↔ JSON — Convert between CSV and JSON formats. Handles quoted fields and nested values.
• Character Diff — Compare two texts character by character to spot subtle typos and encoding issues.
• Epoch Batch Converter — Convert multiple timestamps to dates or dates to timestamps in batch.
• JSON to TypeScript — Generate TypeScript interfaces from JSON with inferred types for nested objects.
• URL Slug Generator — Generate URL-friendly slugs with separator, transliteration, and max length options.
• IP Address Info — See your public IP and parse any IPv4/IPv6 for class, private/public, and binary.
• String Escape / Unescape — Escape or unescape text for JSON, HTML, URL, Regex, SQL, or C-style.
• Box Shadow Generator — Generate CSS box-shadow with visual sliders for offset, blur, spread, and color.
• CSS Gradient Generator — Create CSS gradients with 2-4 color stops, linear or radial, and adjustable angle.
• Placeholder Image — Generate placeholder images with custom size, colors, and text. Download as PNG.
• Text to Speech — Read text aloud using the Web Speech API. Choose voice, rate, and pitch.
• Unit Converter (px/rem) — Convert between px, rem, em, pt, and %. Configurable base font size.
• HTML Live Preview — Write HTML/CSS/JS and see a live preview side by side. Auto-updates as you type.
• Table Generator — Create Markdown or HTML tables visually. Fill in cells and copy the output.
• Meta Tag Generator — Generate SEO meta tags, Open Graph, and Twitter Card tags for your pages.
• Flexbox Playground — Visual CSS Flexbox playground with live preview and generated CSS.
• JSON Key Sorter — Sort all JSON object keys alphabetically, recursively. Ascending or descending.
• Bulk Find & Replace — Apply multiple find/replace pairs at once. Supports regex mode.
• Data Size Converter — Convert between bytes, KB, MB, GB, TB, PB. Binary (1024) or decimal (1000).
• ASCII Art Text — Convert text into large ASCII art using block characters.
• Open Graph Preview — Preview how your page looks when shared on Twitter, Facebook, and LinkedIn.
• .gitignore Generator — Select from 13+ templates (Node, Python, Java, Go, etc.) and combine into a .gitignore.
• JSON Schema Validator — Validate JSON documents against JSON Schema draft-07. Check types, required fields, and constraints.
• XML to JSON — Convert XML to JSON using DOMParser. Handles attributes, text content, and repeated elements.
• JSON Flattener — Flatten nested JSON to dot-notation keys or unflatten back. Custom separator options.
• Data Faker — Generate fake data: names, emails, phones, UUIDs, dates, and more as JSON arrays.
• Visual Regex Builder — Build regex patterns visually by adding segments. Test with highlighted matches.
• API Response Mocker — Define mock API responses with status codes, headers, and delays. Get curl/fetch snippets.
• JSON to CSV (Advanced) — Convert JSON to CSV with nested object flattening, custom delimiters, and download.
• TOML ↔ JSON — Convert between TOML and JSON. Supports sections, arrays, strings, numbers, and booleans.
• GraphQL Schema Generator — Define types and fields visually, generate GraphQL SDL with descriptions and relationships.
• SQL to MongoDB — Convert SQL SELECT queries to MongoDB find() syntax. Handles WHERE, ORDER BY, LIMIT, LIKE, IN.
• HMAC Generator — Compute HMAC-SHA256/384/512 using Web Crypto API. Hex and base64 outputs.
• CORS Header Builder — Configure CORS headers visually. Generate HTTP headers + Express/nginx/Apache code.
• CSP Builder — Build Content Security Policy headers with toggleable directives and source options.
• SRI Hash Generator — Generate Subresource Integrity hashes and full script/link tags with integrity attributes.
• API Key Generator — Generate random API keys in hex, base64, UUID, or prefixed formats. Bulk generate.
• TOTP Code Generator — Generate time-based one-time passwords with live countdown. HMAC-SHA1 via Web Crypto.
• PEM Certificate Decoder — Decode X.509 PEM certificates. Extract subject, issuer, validity dates, and serial number.
• OAuth Token Inspector — Inspect OAuth/JWT tokens. Decode header+payload, check expiration, analyze opaque tokens.
• Password Hash (PBKDF2) — Hash passwords with PBKDF2 using Web Crypto. Configurable iterations, salt, and key length.
• Key Pair Generator — Generate RSA-2048/4096 or ECDSA P-256/P-384 key pairs. Export as PEM format.
• Border Radius Generator — Visual CSS border-radius editor with 4 corner sliders and live preview.
• CSS Grid Generator — Configure grid columns, rows, and gap visually. See numbered cells and copy CSS.
• Animation Keyframe Builder — Build CSS @keyframes animations visually with live preview and generated CSS.
• Color Palette Generator — Generate complementary, analogous, triadic, and tetradic palettes from a base color.
• Typography Scale — Calculate a modular type scale with visual preview and CSS custom properties.
• Glassmorphism Generator — Create frosted glass effects with adjustable blur, opacity, and border. Live preview.
• Neumorphism Generator — Generate soft UI shadows with flat/concave/convex/pressed shapes. Light and dark modes.
• SVG Path Visualizer — Paste SVG path data, see it rendered with command breakdown and scale controls.
• Favicon Generator — Draw on a pixel grid to create favicons. Download as PNG with HTML link tags.
• Tailwind Class Sorter — Sort Tailwind CSS classes in the recommended order (layout → spacing → typography → etc).
• Markdown to HTML — Convert Markdown to raw HTML. Supports headings, bold, italic, links, code blocks, lists.
• HTML to Markdown — Convert HTML to Markdown using DOMParser. Handles all common elements recursively.
• Line Number Adder — Add line numbers to text with configurable start, padding, separator, and alignment.
• Text Column Aligner — Align tab or space-separated text into neat columns. Left, right, or center alignment.
• Regex Cheat Sheet — Searchable regex reference with character classes, quantifiers, anchors, groups, and common patterns.
• Git Command Builder — Build git commands visually. Select operation, configure options, copy the generated command.
• Docker Compose Generator — Generate docker-compose.yml visually. Add services with images, ports, volumes, and env vars.
• Nginx Config Generator — Generate nginx server blocks with SSL, gzip, proxy_pass, and security headers.
• Unified Diff Viewer — Parse and visualize git diff output with color-coded additions, deletions, and stats.
• JSON Stringify / Parse — Stringify with configurable indent or recursively unwrap double-stringified JSON step by step.
• Bitwise Calculator — AND, OR, XOR, NOT, and shift operations on numbers in decimal, hex, or binary.
• Unit Converter — Convert between length (mm→mi), weight (mg→lb), and temperature (C/F/K) units.
• Timezone Converter — Convert time across 15 timezones (UTC, US, Europe, Asia, Australia). Uses Intl API.
• Date Calculator — Add/subtract days/weeks/months/years or find the difference between two dates.
• Pomodoro Timer — Focus timer with circular progress, configurable work/break durations, and sound alerts.
• Stopwatch — Precise stopwatch with lap times, best/worst highlighting, and export. Uses rAF.
• Countdown Timer — Set hours/minutes/seconds, see a progress bar, and get a sound alert when done.
• Mortgage Calculator — Monthly payment, total interest, pie chart breakdown, and 12-month amortization table.
• Tip Calculator — Calculate tips with preset percentages, custom amounts, and bill splitting.
• Color Blindness Simulator — See how colors appear under protanopia, deuteranopia, tritanopia, and achromatopsia.
• JSON Diff — Compare two JSON documents by path. See added, removed, and changed values with stats.
• cURL Builder — Build HTTP requests with method, headers, query, body, and auth. Export as curl, fetch, or Node.js.
• Cookie Parser — Inspect Set-Cookie headers and Cookie strings. Decode values and surface security warnings.
• Subnet Calculator — IPv4 CIDR calculator. Network, broadcast, host range, mask, wildcard, and binary breakdown.
• User Agent Parser — Parse a User-Agent string into browser, engine, OS, device, and CPU details.
• MIME Types Lookup — Search common MIME types by extension, type, or description. Quick reference for Content-Type.
• Keycode Info — Press any key to inspect its key, code, keyCode, location, and modifier state.
• ULID Generator — Generate sortable, time-prefixed unique IDs (Crockford base32). Decode the timestamp from any ULID.
• Roman Numerals — Convert between Roman numerals and integers (1–3999). Auto-detects direction and shows the breakdown.
• Math Evaluator — Evaluate math expressions safely with functions, constants, and variables. No eval used.
• NATO Phonetic Alphabet — Convert text to and from the NATO phonetic alphabet (Alpha, Bravo, Charlie…).
• JWT Encoder / Signer — Sign JWTs with HS256/384/512. Build header and payload, paste a secret, and copy the token.
• CSS clamp() Generator — Build fluid CSS values that scale linearly between two viewports. Output in px or rem.
• List Tools — Sort, dedupe, shuffle, prefix/suffix, and run set operations (union, intersect, diff) on lists.
• Markdown TOC Generator — Extract a table of contents from Markdown with GitHub-style anchor slugs and configurable depth.
• Unicode Inspector — Inspect codepoints, UTF-8 bytes, JS/HTML/CSS/URL escapes, and normalize text (NFC/NFD/NFKC/NFKD).
• GitHub Trending — Browse trending GitHub repos by language and time range. Sort, filter, and export as Markdown or JSON.
• Steam Trending — Live top-played games on Steam with concurrent players, 24h peak, genre, and store price.
• ASX Watchlist — Personal Australian-shares watchlist with live price, % change, day and 52-week range, and sparkline.
• Crypto Watchlist — Top coins by market cap with 24h/7d change and sparklines. Star coins to build a personal watchlist.
• Hacker News Monitor — Live HN top, new, best, Ask, Show, and job feeds with score / domain filters and Markdown export.
• NPM Download Trends — Compare npm package download trends side by side. Pick a 7/30/90/365-day range with rolling-average smoothing.
• Currency Rate Monitor — Live FX rates with 30/90/365-day sparklines per pair. ECB-sourced via Frankfurter, no key required.
• Weather Dashboard — Multi-location weather with current conditions, 24h hourly chart, and 7-day forecast. Powered by Open-Meteo.
• Mini Spreadsheet — A1 cells, ranges, and a real formula engine: SUM/AVG/IF/ROUND/CONCAT etc, with cycle detection and CSV export.
• WebSocket Inspector — Connect to any ws:// or wss:// endpoint, send text/JSON, watch the message log with timestamps and ping/pong RTT.
• Regex Railroad — Parse a regex into an AST and render it as a railroad diagram. Groups, alternations, classes, quantifiers, lookarounds.
• CSV Data Explorer — Drop a CSV. Type-inferred columns, sortable table, per-column histograms and top-value charts, range/category filters.
• Audio Spectrum — Real-time spectrum + waveform + peak meter via Web Audio. Microphone, audio file, or built-in tone generator.
• EXIF Viewer — Drop a JPEG and inspect EXIF: camera, lens, exposure, GPS map, embedded thumbnail, full IFD tables. Pure-browser parser.
• Palette Extractor — Pull a colour palette from any image with k-means in CIE Lab space. Hex / RGB / HSL plus Tailwind + CSS exports.
• WebRTC Network Tester — ICE candidate gathering against STUN/TURN. Public IP, NAT type guess, every host/srflx/relay candidate.
• Sequence Diagram — Text-DSL → SVG sequence diagrams (mermaid-style without the dep). Participants, sync/async messages, alt/loop blocks.
• Sudoku Solver — Solve, generate (uniquely), and play. Constraint propagation + backtracking, conflict highlighting, pencil marks, hints.
• Pathfinding Visualizer — Animated A* / Dijkstra / BFS / DFS on a grid with maze generators. Drag start/goal, paint walls, watch the search.
• Sort Algorithm Visualizer — Animated bubble / insertion / selection / shell / merge / quick / heap with comparison and swap counts.
• Game of Life — Conway's Game of Life with a pattern library (gliders, pulsar, gun, R-pentomino), paint mode, and configurable B/S rules.
• DNS Lookup (DoH) — All record types via DNS-over-HTTPS. Cloudflare or Google resolver, DNSSEC AD bit, and copy-as-zone-file.
• EXPLAIN Visualizer — Paste a Postgres EXPLAIN ANALYZE plan and see it as a tree with self-time bars, hot-node ranking, and mis-estimate detection.
• Image Editor — Non-destructive editor: crop, rotate, exposure, contrast, saturation, hue, temperature, tint, highlights/shadows, vignette, sharpen, blur, tone curve, live histogram.
• Video Editor — Multi-clip timeline: trim, speed, rotate/flip, filters, reorder, frame-grab, and export combined timeline as WebM. Pure browser, no upload.
• Hex Editor — Drop a binary file. View hex + ASCII columns with offsets, search by text or hex, edit any byte, save the result.
• CSS Selector Playground — Paste HTML and a selector. Live-highlight matches in the preview, list elements with paths, and compute specificity (a, b, c).
• Bezier Easing — Drag the handles. Animate a ball. Copy CSS / JS / Tailwind snippets for the curve.
• Force-Directed Graph — Paste edges (CSV or JSON), drag nodes, watch the layout settle. Adjust forces, export SVG.
• JSON → Code — Paste JSON, get type-safe classes in Go, Python, Rust, Java, Kotlin, Swift, or C#. Hand-rolled type inference.
• L-System Fractals — Lindenmayer rewriting + turtle graphics. Pick Koch / Sierpinski / Dragon / Plant / Hilbert or write your own production rules.
• Markov Text — Train an n-gram chain on text (char or word level) and sample new lines. Configurable temperature + seeded reproducibility.
• Vim Trainer — Practice vim motions interactively. Reach targets with hjkl / w / b / e / 0 / ^ / $ / gg / G / f / t / counts.
• Speed Test — Browser-side download / upload throughput and ping. Configurable endpoints. Defaults to Cloudflare's open speed test.
• PDF Inspector — Drop a PDF. See header, trailer, every indirect object, decompressed streams, and extractable text. Hand-rolled parser, no pdf.js.
• Mock REST API — Service-worker-backed mock API. Define routes + responses, intercept fetches under /_mock/* with template substitution and configurable delay/status.
• Programmer Calculator — RPN calculator with DEC/HEX/OCT/BIN modes, configurable bit width, bitwise ops, and an infix evaluator. BigInt under the hood.
• Outliner / Mind Map — Keyboard-first tree outliner. Tab indents, Enter splits, Cmd+arrows reorder. OPML and Markdown import / export.
• OAuth 2.0 Flow — Step through Authorization Code, Code+PKCE, Device, and Client Credentials flows with real PKCE pairs and sample tokens.
• Sound Pad — 4×4 sample pad. Drop audio files or record from mic. Per-pad pitch/volume/loop. Save and load pad sets as JSON.
• Habit Tracker — Daily habit tracker with a GitHub-style heatmap. Multiple habits, current/longest streak, completion rate over a window.
• Logic Gates — Drag gates onto a canvas, wire output → input pins, and see live signal propagation + a generated truth table.
• JSON Schema Form — Paste a JSON Schema, get a generated, validated form. Inline error messages, live JSON value, draft-07 subset.
• Contrast Auditor — WCAG 2.1 contrast ratios for colour pairs, with auto-suggested fixes. Paste raw CSS to audit a stylesheet at once.
• Mini Analytics — Self-hosted in-browser analytics. Capture events from your app via BroadcastChannel; explore daily counts, funnels, and cohorts.
• Shader Playground — Shadertoy-compatible WebGL fragment shader playground with live compile errors and a starter library.
• Compression Lab — Compare gzip / deflate / deflate-raw on your file or text. Roundtrip-verified, with timing and ratio per format.
• Image Format — Batch convert images to JPEG / PNG / WebP / AVIF with optional resize. Download all as a ZIP. Pure browser.
• Flowchart Renderer — Mermaid-style text DSL to SVG flowchart with proper layered layout. No mermaid dependency.
• PWA Manifest — Visual web app manifest builder. Drop one logo, get all icon sizes plus maskable, exports as ZIP.
• ICS Calendar Builder — Build, parse, and round-trip RFC 5545 ICS calendars with VEVENT and RRULE. 75-octet line folding done right.
• Classical Cipher Toolkit — Caesar, ROT13, Atbash, Vigenère, Rail-Fence with English chi-squared cracker and live letter-frequency chart.
• IEEE 754 Float Inspector — Toggle individual sign / exponent / fraction bits in binary64 or binary32. See the decoded value, classification, and absolute error live.
• Punycode / IDN Inspector — Round-trip Unicode ↔ ACE (xn--) using a hand-rolled RFC 3492 implementation. Flags mixed-script and Cyrillic / Greek look-alikes.
• AES-GCM Vault — Encrypt and decrypt text or files with AES-256-GCM and a PBKDF2-derived key. Self-contained portable blob, zero servers.
• Barcode Generator — 1D barcodes (Code 128, Code 39, EAN-13, UPC-A) rendered to SVG. Hand-rolled encoders per ISO/IEC 15417 and 16388.
• Morse Code Translator — International Morse with sidetone audio playback. Configurable WPM, frequency, and Farnsworth spacing.
• CSV to SQL — Type-inferred CREATE TABLE plus batched INSERTs for Postgres / MySQL / SQLite / MSSQL. Override types per-column before emitting.
• Diceware Passphrase — Word-list passphrases with crypto-secure RNG, live entropy in bits, and time-to-crack at offline-attack rates.
• HTTP Header Analyzer — Paste raw HTTP response headers, get a 0–100 security score plus parsed CSP / HSTS / CORS / cache findings.
• Function Plotter — Multi-trace y = f(x) plotter. Drag to pan, wheel to zoom, asymptote-aware sampling. sin, cos, exp, log, etc.
• Statistics Calculator — Mean, median, mode, sample/population stdev, quartiles, skewness, kurtosis, histogram, and box plot from a number list.
• JSON to JSON Schema — Generate Draft-07 JSON Schema from a sample. Detects date-time / email / uri / ipv4 / uuid; merges array element shapes.
• GeoJSON Viewer — Render GeoJSON FeatureCollections as inline SVG with auto-fit Mercator projection. Click shapes to inspect properties.
• SVG Optimizer — Minify SVG: round numbers, drop default attributes, strip comments and metadata, prune unused defs. No dependencies.
• Code Screenshot — Carbon-style code screenshots with window chrome, gradient backgrounds, and 5 themes. Hand-rolled syntax highlighter, PNG export.
• Conventional Commit — Compose Conventional Commits 1.0 messages with type, scope, breaking change marker, and footers. Live linting against the spec.
• README Badge Generator — Shields.io-style badges as inline SVG, no third-party server. Multiple styles, color presets, Markdown export.
• JSON Tree Visualizer — JSONCrack-style nested-node tree view of any JSON. Pan with drag, zoom with the wheel. Pure browser, no deps.
• ER Diagram from SQL — dbdiagram.io-style: paste CREATE TABLE statements and get an ER diagram with FK edges. Hand-rolled SQL parser.
• Investment Calculator — Compound interest with monthly contributions, optional annual raise, inflation-adjusted real balance, and FIRE goal projection.
• JSON Patch Generator — Diff two JSON documents and produce an RFC 6902 patch with add / remove / replace / move ops. Round-trip verified.
• Random Wheel Picker — Spin a weighted wheel to pick a random item. Crypto-secure RNG, tick-tock sound, optional remove-on-win for raffles.
• Bookmarklet Builder — Wrap any JavaScript snippet in an IIFE, URI-encode it, and get a draggable javascript: link for your bookmark bar.
• Subtitle Editor — Edit SRT / VTT subtitles against a video timeline. Drag cues, retime, export. Pure browser, video never uploaded.
• Periodic Table — All 118 elements in the standard layout. Search by symbol/name/Z, highlight by category / block / phase, click for full detail.
• Snowflake ID Parser — Decode Twitter / Discord / Instagram / Sonyflake snowflake IDs. Extract timestamp, machine ID, sequence, and bit layout.
• A/B Test Significance — Two-proportion z-test on conversion rates. p-value, confidence interval, and sample-size estimator for the next test.
• JSON Merge Patch — RFC 7396 recursive merge patch — diff or apply. Distinct from RFC 6902. null marks deletion. Round-trip verified.
• Sankey Diagram — Multi-stage flow diagram from one flow per line. Hand-rolled depth layout with barycenter ordering, inline SVG export.
• FFmpeg Command Builder — Visual builder for common ffmpeg ops: convert, trim, scale, fps, extract audio, concat, watermark, GIF, screenshot, loudnorm.
• Markdown Slides — Marp-style: write slides in markdown, separate with ---. Fullscreen present, arrow-key navigation, export as standalone HTML.
• Mandelbrot Explorer — Interactive zoom into the Mandelbrot set with smooth coloring and 5 palettes. Drag to pan, wheel to zoom, PNG export.
• OG Image Generator — Build 1200×630 social-preview images in your browser. Title, subtitle, badge, gradient backgrounds, real canvas wrapping, PNG export.
• dotenv Manager — Parse .env, generate .env.example with masked values, validate against a schema (number / bool / url / email / json types).
• Color Picker from Image — Drop an image, hover for a magnifier, click to pick. HEX / RGB / HSL outputs and a 24-pick history. Image stays in your browser.
• Year Heatmap — GitHub-style contributions calendar from a date list. Streaks, totals, 5 themes, SVG export. UTC-safe, pure browser.
• Number Theory — Primality (Miller-Rabin), prime factorisation (Pollard rho), GCD/LCM, modular inverse, Euler totient, divisors. BigInt only.
• Password Strength Auditor — Pattern-aware entropy estimate. Detects sequences, keyboard runs, common passwords, leetspeak. Time-to-crack at four attacker rates.
• CSS 3D Transform — Live playground for rotate3d / translate3d / scale with perspective. Card / cube / logo preview, copy the generated CSS.
• Image Diff Checker — Pixel-by-pixel comparison of two images with anti-aliasing-aware threshold. Diff overlay, side-by-side, and swipe modes.
• Loan Comparison — Compare amortising loans side-by-side: monthly payment, total interest, fees-baked-in APR, balance curves over time.
• Maze Generator — Static mazes with three algorithms (backtracker, Prim, Wilson) and an A* solver. Seedable for reproducibility, SVG export.
• Email-friendly Plain Text — Paste markdown or rich text, get clean plain text safe for Gmail / Outlook / Apple Mail. Strips **, ##, smart quotes, hidden whitespace.
• Idea Capture — Quick-jot inbox for ideas by voice or text. Live transcription, optional audio recording, #tags, search, Markdown / JSON export.
• Personal Calendar — Month view with click-to-add, drag-to-reschedule events. Stays in your browser; export as .ics to sync with Google / Apple Calendar.
• Meeting Planner — Find a meeting time across timezones. Score every UTC hour, see who's at work / awake / asleep, pick the best slot.
• Expense Splitter — Track shared spend in a group, split each expense among any subset, settle up with the fewest possible transfers.
• Recipe Scaler — Paste a recipe, scale ingredient amounts up or down. Density-aware cup ↔ gram conversions for flour, sugar, butter, etc.
• Flashcards — Spaced-repetition with SuperMemo SM-2. Bulk import (TSV/CSV/pipe), grade your recall, never see a card before it's due.
• Kanban Board — Drag-and-drop board with WIP limits, #tags, priority, click-to-edit cards, and Markdown export. All in your browser.
• Tournament Bracket — Single-elimination bracket generator. Standard 1-vs-N seeding, BYEs auto-advance, click winners to advance through rounds.
• Time Tracker — Toggl-style time tracking. Tag entries by project, see daily totals and per-project breakdowns, export as CSV.
• Decision Matrix — Weighted scoring matrix. Score each option (0–10) on each criterion, set weights, see who wins and by how much.
• Dice Roller — Standard notation: 2d6, d20+5, 4d6dl1, 2d20kh1 (advantage), 1d10! (exploding). Per-die trace and roll history.
• Whiteboard — Excalidraw-style sketching. Rectangles, ellipses, arrows, freehand and text. Drag to move, undo/redo, export to SVG.
• Mind Map — Visual mind-mapping with collapsible branches and colour grouping. Tab adds a child, Enter a sibling. Markdown export.
• Calcpad — Soulver-style calculation notepad. Type maths line-by-line with variables, unit conversions and line references — live results.
• AI Prompt Library — Build, store, and reuse AI prompts. {{Variable}} placeholders, structured authoring (Role / Task / Context / Format / Examples / Constraints), token estimate.
• Online Income Ideas — Find legitimate ways to make money online based on your skills, capital, time, and risk tolerance. 27 paths with realistic ranges, time-to-first-dollar, and honest caveats.
• AWS Services Guide — Browse 100+ AWS services across 18 categories with practical when-to-use, when-NOT-to-use, alternatives, pricing model, and 2025 re:Invent What's New highlights.
• Google Cloud Services Guide — Browse Google Cloud services with when-to-use guidance, alternatives, pricing model shapes, and Cloud Next '25 / '26 What's New highlights (Gemini Omni, ADK, TPU v7, BigLake).
• Azure Services Guide — Browse Microsoft Azure services with when-to-use guidance, alternatives, pricing model shapes, and Ignite 2025 What's New highlights (Foundry, Agent 365, Cobalt 200, Fabric updates).
• Workout Tracker — Strength training log with sets × reps × weight, RPE, warm-up flag. Tracks volume, estimated 1RM via Epley, personal bests, and CSV export.
• API Test Suite — Postman-style runner. HTTP requests with assertions on status / time / headers / JSON / body, captures into a shared env, and {{variable}} substitution.
• Resume Builder — Build a clean resume in your browser. Live preview, Markdown / JSON Resume v1 export, and print-to-PDF via the browser dialog. Stays local.
• Budget Tracker — Privacy-first envelope budgeting. Categories, monthly limits, optional rollover, 6-month trends, CSV import/export. No bank linking, all in your browser.
• Typing Speed Test — Industry-standard typing test. Live WPM, net WPM, accuracy %, per-key error tally, and 100-test history. 15/30/60/120s timed or full-passage modes.
• Meal Planner — Plan a week of meals across breakfast / lunch / dinner / snack. Automatic grocery list aggregates ingredients across all slots with serving scaling.
• Travel Itinerary — Plan trips day-by-day with stops (flights, stays, activities, food). Track packing, see total budget by category, export to Markdown.
• Reading Tracker — Goodreads-lite. Track books you want to read / are reading / finished, with ratings, dates, page progress, tags, and yearly stats.
• Daily Journal — Private daily journal with mood, tags, weather, streaks, mood histogram, on-this-day flashbacks. Auto-saves locally.
• Recommender — Movie, book, and song recommendations tuned to your mood, genre, and decade. 90 hand-picked items with transparent scoring. No tracking.
• CSS Specificity Calculator — Score any selector as (inline, ID, class, type) and rank multiple selectors by who wins. Handles :is(), :not(), :where() per the modern spec.
• String Similarity — Compare two strings with Levenshtein, Damerau-Levenshtein, Jaro-Winkler, Hamming, cosine n-gram, and LCS metrics. Live similarity scores.
• Markdown Table Editor — Edit a Markdown table in a spreadsheet-style grid. Per-column alignment, paste CSV/TSV blobs to spill data across rows and columns.
• Code Typing Trainer — Typing speed test for code. JavaScript, Python, Go, Rust snippets with proper indentation. Tracks WPM, raw WPM, accuracy, and errors.
• Network Monitor — Periodic ping for any HTTPS endpoint. Charts latency and uptime per target with mean / p95. Cache-busted HEAD with no-cors fallback.
• Keyboard Tester — Press any key and watch it light up on a virtual keyboard. Diagnoses dead, sticky, or unregistered keys. Coverage tracker for full-board sweeps.
• JWT Verifier — Decode AND cryptographically verify a JWT against an HMAC secret or RSA/ECDSA public key. Web Crypto API; tokens never leave your browser.
• Color Contrast Grid — Bulk WCAG 2.1 audit. Paste a list of foregrounds and backgrounds, get an N×M matrix with AA/AAA pass badges per cell.
• JSON Mock Server — Design REST endpoints with method + path pattern + JSON body. In-page tester plus a copy-pasteable fetch monkey-patch.
• Tokenizer Playground — Visualise how text splits into LLM-style tokens. Coloured token highlights plus chars/4 and words/0.75 length estimates side by side.
• Image Steganography — Hide a UTF-8 message inside a PNG via least-significant-bit encoding. Decode any image to recover the message. Lossless, reversible.
• JS Microbenchmark — Compare two JavaScript snippets head-to-head. Reports ops/sec with 95% confidence intervals. Pure browser; runs locally with new Function.
• WebAuthn Tester — Register a real passkey on Touch ID / Windows Hello / hardware key. Authenticate and inspect the public-key credential. Pure browser.
• EML Viewer — Parse a raw RFC 5322 email. Decoded headers, MIME parts, attachments, and DKIM/SPF/DMARC results from Authentication-Results.
• CSS → Tailwind — Paste CSS, get Tailwind v3 classes. Maps spacing, colours, typography, layout. Surfaces unmappable declarations explicitly.
• Image → ASCII — Convert any image to ASCII art. Configurable character ramp, output width, and optional colour. Pure browser; no upload.
• HAR Viewer — Open .har files in your browser. Phase-coloured waterfall, status/MIME/URL filters, click-to-inspect headers and bodies.
• YAML / JSON Diff — Semantic diff for YAML and JSON. Different key order is ignored; auto-detects format per side. Side-by-side tree with added / removed / changed badges.
• Multi-Cron Calendar — Drop multiple cron lines and see them painted on a week × hour grid. Overlaps, gaps, and weekend fires become obvious.
• Mermaid Live Editor — Edit Mermaid diagrams with live preview. Flowchart, sequence, class, state, gantt, ER, mindmap, gitgraph and more. SVG download.
• OpenAPI Viewer — Read OpenAPI 3 / Swagger 2 specs. Operations grouped by tag, parameters and responses surfaced. JSON or YAML, browser-only.
• GraphQL Query Builder — Paste an SDL schema and click your way through to a valid query. Tracks required args. No execution, just composition.
• Sitemap Viewer — Drop sitemap.xml or robots.txt. Tree view of URLs grouped by path with lastmod / changefreq / priority badges.
• License Picker — Choose an open-source license by intent. SPDX IDs, permissions / conditions / limitations summary, and copyable LICENSE text.
• SQL Explainer — Plain-English step-by-step breakdown of any SQL query. Flags dangerous patterns like UPDATE without WHERE.
• Secret Scanner — Detect leaked credentials in source code or .env files. Known formats (AWS, GitHub, Stripe, JWT, …) plus high-entropy detection.
• Protobuf Decoder — Decode raw Protocol Buffers wire-format bytes (hex or base64) without a .proto schema. Detects nested messages and UTF-8 strings.
• Dockerfile Lint — Hadolint-style rule warnings, plus a layer-count estimate so you can spot unnecessary RUN splits and image bloat.
• Browserslist Visualizer — Type a browserslist query, see which browsers and versions match with approximate global usage. Pure browser; no fetch.
• AST Explorer — Paste JS / TS source, see the parsed AST tree. Hover any node to highlight its source span. Acorn parser, lazy-loaded.
• Prettier Playground — Format JS / TS / JSON / CSS / Markdown / HTML / YAML with the real prettier package. All standard options as toggles.
• .env Compare — Diff two .env files. Missing keys, value drift, weak placeholders, shell-quoting issues, duplicate-key warnings.
• TSConfig Visualizer — Every option in your tsconfig.json explained, with risk-level badges, sane presets (strict / react-vite / node / library), and warnings for risky settings.
• Regex from Examples — Paste positive (and optional negative) string examples, get a regex that matches all positives. Trie + character-class collapse. Validates against negatives.
• Lottie Player — Drop a Lottie / Bodymovin JSON, see it animate. Frame scrubber, speed, loop, and quick stats. Lazy-loaded lottie-web.
• curl Importer — Paste a curl command, get equivalent JS fetch / axios / Node / Python / HTTPie / Postman v2.1 collection. Imports into Bruno and Insomnia too.
• Font Inspector — Drop a TTF / OTF / WOFF / WOFF2. Name table, glyph count, weight class, italic angle, and a live render at multiple sizes.
• Bundle Treemap — Visualise webpack stats.json, esbuild metafile, or rollup-plugin-visualizer JSON as a clickable hierarchical treemap.
• Archive Inspector — Drop a ZIP or TAR. Walk entries with sizes and timestamps, preview text and image content. Pure browser; no upload.
• Polyline Encoder/Decoder — Convert between Google polyline strings and lat/lon coordinate lists. Visualises the path. Precision 5 (Google) or 6 (Mapbox).
• EBNF Railroad — Paste an EBNF grammar, render railroad (syntax) diagrams for each rule. Visualises grammars the way the JSON.org spec does.
• QR Scanner — Scan QR codes from your camera or an uploaded image. Detects URL, Wi-Fi config, OTP secret, and vCard payloads.
• Emoji Search — Search by name or keyword, browse by category, click to copy. Recently-used emojis remembered locally.
• EXIF Stripper — Drop images, see what metadata is in them, download cleaned copies. Lossless byte-level strip for JPEG/PNG; canvas re-encode for any format.
• Screen Recorder — Record screen, window, or tab. Optional mic + system audio mix. Outputs WebM. Pure browser; never leaves your device.
• GraphQL Schema Visualizer — Paste an SDL schema, see types as connected cards. Highlights the connections between your domain types.
• CSV Diff — Diff two CSV / TSV files row-by-row. Auto-detects delimiter and key column. Highlights added / removed / changed cells.
• BIP39 Mnemonic — Generate and validate BIP39 seed phrases. Convert between mnemonic, entropy hex, and seed. Audited crypto, browser-only.
• Unicode Character Search — Find characters by codepoint, name, or block. Click to copy. Curated set of high-traffic punctuation, math, arrows, dingbats.
• HTTP Load Generator — Browser-side burst test. p50/p95/p99 latency, RPS, error rate by status group, latency histogram. Use only on endpoints you own.
• jq Playground — Run real jq filters in your browser via WebAssembly. Recipes for keys, select, map, group_by, sort_by. Output toggles for raw / sort / compact.
• S3 Pre-signed URL Inspector — Decode AWS Signature V4 pre-signed URLs (S3, R2, MinIO, Spaces). Bucket, key, region, expiry countdown, signed headers, vendor detection.
• Eyedropper — Pick colours from any image with a magnified loupe, or from anywhere on screen via the native EyeDropper API. HEX / RGB / HSL with click-to-copy and a recents palette.
• OpenSSL Command Builder — Generate keys, certs, CSRs, convert PEM/DER/PKCS#12, test TLS endpoints, encrypt files. Visual builder for the openssl CLI; copy a working command.
• OKLCH Color Studio — Pick OKLCH colours with live HEX / RGB / HSL conversions, sRGB gamut warnings, WCAG + APCA contrast, and a Tailwind-ready 50→950 tonal ramp.
• IPv6 Calculator — Parse any IPv6 form, get RFC 5952 canonical text and full expansion. Subnet range, classification, reverse DNS, /48 → /64 splitter, EUI-64 from MAC.
• WebAssembly Inspector — Drop a .wasm file. Walks every section (types, imports, exports, code, custom name), shows function signatures, and disassembles function bodies into a WAT-style listing.
• Lambda Calculus Playground — Untyped λ-calculus reducer with capture-avoiding α-renaming. Step through normal-order or applicative reductions. Church numeral pretty-printing, Y combinator, SKI, classic predecessor.
• State Machine Simulator — Paste an XState-style FSM as JSON, see it as a live graph, click events to step through it. Auto layout, history with undo, shareable URL.
• Quantum Circuit Simulator — Build a circuit on up to 6 qubits with H, X, Y, Z, S, T, S†, T† and CNOT. Live full state vector, basis-state probabilities, per-qubit Bloch indicators with phase colouring.
• Reaction-Diffusion Lab — Live Gray-Scott PDE on a 220×220 torus. Brush to seed, switch between Pearson presets (spots, stripes, spirals, coral, mitosis, solitons, u-skate, chaos). Save the current canvas as PNG.
• Voronoi & Delaunay Studio — Click to add sites, drag to morph. Real-time Bowyer-Watson Delaunay triangulation with the dual Voronoi diagram, circumcircle overlay, and clean SVG export.
• Encrypted Share Link — Encrypt a secret with AES-GCM-256 in your browser, get a URL whose ciphertext lives in the fragment so it never reaches a server. PBKDF2 passphrase mode or random-key one-link mode.
• PII / Secrets Redactor — Paste a log or transcript, get a redacted version. Detects emails, phones, Luhn-validated cards, SSNs, mod-97 IBANs, JWTs, AWS / GitHub / Slack / Stripe keys, IPs, and PEM private keys.
• License Compatibility Checker — Paste a package.json, package-lock.json, or `name@ver: SPDX` lines. Get OK / REVIEW / BLOCK verdicts for shipping under MIT, Apache, GPL, AGPL, or proprietary, with plain-English reasons.
• Git Branch Namer — Generate clean, consistent git branch names from ticket descriptions with configurable prefixes and separators.
• DNS Record Generator — Build DNS zone file records visually. Generate A, AAAA, CNAME, MX, TXT, NS, SRV, and CAA records.
• README Generator — Generate a professional README.md for your project. Fill in the fields and copy the markdown.
• SSH Config Builder — Build your ~/.ssh/config file visually. Add hosts, configure options, and copy the result.
• Chmod Visualizer — Visualize Unix file permissions interactively. Toggle bits or type octal to see symbolic representation.
• HTTP Header Builder — Build HTTP headers visually. Get raw header format and curl flags ready to paste.
• Email Header Analyzer — Paste raw email headers — Gmail's Show original, Outlook's View source, or a .eml file. Get a Received-chain timeline, SPF/DKIM/DMARC/ARC verdicts, and red-flag findings for spoofing.
• URL Tracker Stripper — Paste URLs, get clean URLs. Strips utm_*, fbclid, gclid, mkt_tok, ref_=, plus site-specific Amazon/YouTube/eBay tracking. Optionally unwraps Outlook Safe Links / Slack / FB outbound redirectors.
• Meeting Time Finder — Add attendees with timezone and working hours; the tool ranks 30-min slots over the next week by how many fit. Heatmap, weekend exclusion, civility-weighted score, copy-as-Slack summary.
• .gitignore Auditor — Paste ignore rules and a list of paths; see which paths git ignores and exactly which rule (and line) matched, negation overrides included. Full glob semantics — answers 'why isn't my file committed?'.
• Semver Range Playground — Test which versions a node-semver range allows. Caret, tilde, x-ranges, hyphen ranges, comparators, OR sets, prerelease rules — with the resolved lower/upper bounds spelled out.
• Cache-Control Builder & Simulator — Compose a Cache-Control header from toggles, then drag a time slider to watch how a browser and a CDN treat the response as it ages: fresh, revalidate, stale-while-revalidate. RFC 9111.
• Australian Take-Home Pay Calculator — What lands in your bank after income tax, the 2% Medicare levy, HELP/HECS, and super. ATO resident rates for 2025-26 and 2024-25, 12% Super Guarantee. Weekly, fortnightly, monthly, yearly.
• Stamp Duty Calculator — Estimate transfer (stamp) duty on a property purchase in NSW, VIC, or QLD using current state revenue office scales. Optional foreign-purchaser surcharge and a side-by-side state comparison.
• GST Calculator — Add or remove Australia's 10% GST. Net-to-gross, strip GST from a total (÷11), or build a multi-line invoice with ex-GST / GST / inclusive totals and GST-free lines for your BAS.
• SCAMPER Brainstormer — Twist one idea seven ways — Substitute, Combine, Adapt, Modify, Put to other use, Eliminate, Reverse — with tailored prompts per lens and a random-word forced-connection generator. Markdown export.
• Business Model Canvas — The 9-block Osterwalder canvas on one page: segments, value props, channels, revenue, costs and more. Per-block prompts, auto-save, load an example, export Markdown or JSON.
• Idea Validator — Score a startup or product idea on eight weighted factors — problem severity, market, willingness to pay, unfair advantage, timing, founder fit — for a 0–100 readiness score and your weakest links.
• BMI & Calorie Calculator — Your BMI and healthy weight range plus BMR and TDEE (Mifflin-St Jeor), with daily calorie targets for losing, maintaining, or gaining weight. Metric or imperial, five activity levels.
• Sleep Cycle Calculator — Best bedtimes or wake times based on 90-minute sleep cycles plus a fall-asleep buffer, so you wake between cycles instead of mid-cycle. Includes an 'if you sleep now' view.
• Debt Payoff Planner — Snowball vs avalanche, side by side. Enter balances, rates and a monthly budget; get payoff date, total interest, payoff order, and how much avalanche saves. Month-by-month balance chart.
• Compound Interest & Savings Goal — Project how savings grow with regular contributions and see the interest-vs-contributions split, or solve how much to save each month to hit a target. Monthly or annual compounding, year-by-year table.
• Percentage Calculator — Every everyday percentage in one place: X% of Y, X is what % of Y, percent change, increase/decrease by %, tip with split, and discount — each with the worked formula shown.
• Fuel Trip Cost & Split — Work out a road trip's fuel bill from distance, efficiency and pump price, then split it between passengers. Supports L/100km, US mpg and UK mpg, with a round-trip toggle.
• Age & Date Difference — Exact age in years, months and days, plus totals in weeks and hours, the weekday you were born, and a countdown to your next birthday. Or compare any two dates.
• Grade & GPA Calculator — Weighted course grade with 'what do I need on the final?' targeting, plus a GPA calculator across courses with credit hours on the 4.0 scale.
• Cooking Measurement Converter — Ingredient-aware cups/tbsp/tsp/ml ↔ grams/oz using real densities (a cup of flour ≠ a cup of honey), plus oven temperature (°C/°F/gas mark) and common substitutions.
• WiFi QR Code Generator — Make a QR guests scan to join your WiFi — no reading out the password. Encodes the standard WIFI: URI in your browser, with a printable card for the wall. Password never leaves the device.
• Bill Splitter — Split a bill with tip, even or weighted shares (the steak-and-wine diner takes extra), and optional round-up. Per-person amounts always add up exactly to the total.
• Random Picker & Team Generator — Paste a list to draw random winners, shuffle into a fair order, or split into balanced teams or groups. Uses cryptographic randomness for a genuinely unbiased shuffle.
• Hash Identifier — Paste a hash and get a ranked list of likely algorithms — MD5, SHA family, bcrypt, NTLM, Argon2, Unix crypt — by length, charset and format markers. The classic CTF 'what hash is this?'.
• ReDoS Regex Analyzer — Check a regex for catastrophic backtracking. Static detection of nested/overlapping quantifiers, plus a live timing test against escalating evil inputs so you can watch the blowup.
• File Magic Identifier — Drop a file to read its magic bytes and identify the real type regardless of extension — images, archives, executables, Office/OOXML, media. Flags extension mismatches. First 1 KB only.
• Entropy Analyzer — Shannon entropy (bits/byte) of text or a file, with a byte histogram and chi-square. Verdict on whether data looks like text, structured, compressed, or encrypted/random.
• Transform Pipeline — CyberChef-lite recipe builder: chain base64, hex, URL, ROT13, case, JSON and line operations, and see the output after every step. Pinpoints exactly where a chain breaks.
• FIRE Calculator — Financial Independence, Retire Early. Your FI number (25× / 4% rule), years to FI from your savings rate, and your Coast FIRE figure. Real-return based, with a balance-vs-target chart.
• Net Worth Tracker — Assets minus liabilities, with dated snapshots so you can watch the trend climb month over month. Privacy-first — no bank linking, everything stays in your browser.
• Runway & Burn Rate — How many months until the cash runs out? Enter cash, expenses and revenue (with optional growth) to get your burn rate, runway, and whether you're 'default alive'.
• Eisenhower Matrix — Prioritise tasks across the urgent/important grid — do, schedule, delegate, delete. Toggle flags to move tasks between quadrants. The big wins live in Important & Not Urgent.
• Expected Value Calculator — Decide under uncertainty. List each option's possible outcomes with probabilities and payoffs to compute expected value, best/worst case, σ, and downside risk — side by side.
• Life in Weeks — Your whole life as a grid of weeks — one row per year, one dot per week. Weeks lived versus weeks ahead. A blunt memento-mori that puts a hundred years into 5,200 dots.
• Time Capsule — Write a message to your future self and get a link that stays sealed until an unlock date you choose. The message lives in the link — no server, no account. Open it in 2125.
• Inflation Time Machine — See how inflation erodes purchasing power over decades. What will today's money be worth in 100 years, and how much would you need then to match it? Rule of 70 included.
• Century Compounding — Watch a sum compound over 100 years — nominal vs inflation-adjusted, contributions vs growth, on a log-scale chart. The staggering shape of long-run compounding.
• Countdown to the Future — Pick a far-future date and watch the live countdown — plus the day of the week it lands on, how old you'd be, generations away, and leap years between now and then.
• Image Cropper & Resizer — Drag a crop box with aspect-ratio presets, resize to a target width, and export as PNG, JPEG or WebP at any quality. Pixel-accurate, all on a canvas — nothing is uploaded.
• Audio Trimmer — Load an audio file, drag start/end on the waveform, preview the selection, and export a trimmed WAV. Web Audio decoding, all client-side — your audio never leaves the device.
• Readability & Text Stats — Flesch Reading Ease, Flesch-Kincaid grade, Gunning Fog, plus word/sentence/syllable counts, reading time, and your longest run-on sentences. For clearer writing.
• Earthquake Monitor — Live recent earthquakes worldwide from the USGS feeds. Filter by magnitude and time window, sort by time or size, with depth, coordinates and tsunami flags. Updates every minute.
• ISS Tracker — Live position of the International Space Station on a world map, with altitude, speed and whether it's in daylight. A short orbit trail, updating every few seconds.
• Exchange Rates — Live foreign-exchange reference rates (ECB data via Frankfurter). Convert an amount across 30+ currencies and browse the full rate table. No key, no tracking.
• Crypto Market — Top cryptocurrencies by market cap with live price, 24h change, market cap, volume and a 7-day sparkline. Multiple quote currencies, gainers/losers sort. Via CoinGecko.
• On This Day — Historical events, births, deaths and holidays for any calendar date, from Wikipedia. Browse what happened on this day through history, with images and links.
• Cron Expression Builder — Build a crontab line visually with field pickers and frequency presets. Get the expression, a plain-English description, and the next run times. The inverse of the cron parser.
• UUID / ULID Inspector — Paste a UUID or ULID to decode its version, variant, and any embedded timestamp (v1/v6/v7/ULID) plus node bits. Validates the format and shows the time baked in.
• Duration Calculator — Add up a list of durations, find the time between two clock times (overnight-aware), or chain + and − on durations. Flexible input, HH:MM:SS and decimal-hours output.
• Running Pace Calculator — Solve for pace, time, or distance — enter any two. Speed in km/h and mph, an even-split table, and Riegel race-time predictions from 5K to marathon. Kilometres or miles.
• Resistor Decoder — Decode 4, 5, and 6-band resistor colour codes to resistance, tolerance, and temperature coefficient, with a live resistor preview. IEC 60062 colours.
• URL Inspector — Break a URL into protocol, host, port, path, query and fragment. Edit query parameters in a table (toggle, rename, change values) and rebuild the URL live.
• Body Fat % Estimator — Estimate body fat from tape measurements using the US Navy circumference method, with a BMI-based cross-check, fat-mass figure, and category band. Metric or imperial.
• Scientific Notation & Sig Figs — Convert a number to scientific and engineering notation, round to N significant figures, and see its order of magnitude and sig-fig count. Handles tiny and huge values.
• JSONL ↔ JSON Array — Convert JSON Lines (NDJSON) to a pretty JSON array and back. Blank lines are skipped and parse errors point to the offending line number. Runs entirely in your browser.
• MAC Address Tool — Validate a MAC address and reformat it across colon, hyphen, Cisco-dot and bare encodings. Decode unicast/multicast and universal/local bits, and generate random local addresses.
• Transfer Time Calculator — Estimate how long a download or upload takes from its size and your connection speed, with decimal/binary size units, bit- and byte-based speeds, and a real-world efficiency factor.
• Query String ⇄ JSON — Parse a URL query string into JSON (repeated keys become arrays) and serialize a JSON object back into an encoded query string. Handles full URLs, +/%20 decoding and nested values.
• Two's Complement Inspector — Enter an integer (decimal, hex, octal or binary) and a bit width to see its unsigned and signed two's-complement value plus hex, octal and binary. Exact for 64-bit via BigInt.
• ASCII Table — A searchable ASCII reference: all 128 codes with decimal, hex, octal and binary, the printable glyph or control mnemonic, and a name. Click any row to copy the character.
• HTTP Basic Auth Builder — Encode a username and password into an Authorization: Basic header, or decode a Basic header/token back into credentials. UTF-8 safe and runs entirely in your browser.
• UTM Campaign URL Builder — Build campaign tracking URLs by attaching utm_source, utm_medium, utm_campaign, utm_term and utm_content, or paste a tagged URL to parse its UTM fields. Existing query params are preserved.
• IPv4 ⇄ Integer Converter — Convert an IPv4 address to its 32-bit integer, hexadecimal and binary forms, and back from any of them. Handy for databases and packed storage. Runs entirely in your browser.
• JSON Pointer Evaluator — Resolve a JSON Pointer (RFC 6901) against a JSON document and browse every pointer it contains. Handles the ~0/~1 escapes and array indices. Runs entirely in your browser.
• Text Wrap & Reflow — Hard-wrap text to a column width with greedy word wrapping (optionally breaking long words), or unwrap soft-wrapped paragraphs back into single lines. Paragraph breaks are preserved.
• Number Formatter — Format a number with locale-aware grouping and fixed decimals, plus compact (1.2M), percent, scientific, English ordinal and spelled-out forms. Runs entirely in your browser.
• CSV Pivot Table — Paste CSV or TSV and build a pivot table: group by one or more fields, cross-tabulate by a column field, and aggregate with sum, count, average, min or max. Export the result.
• Critical Path Scheduler — Enter project tasks with durations and dependencies to compute the critical path (CPM): earliest/latest start and finish, slack, total duration and a Gantt chart. Runs in your browser.
• Template Renderer — Render a Mustache-style template against JSON data with sections, inverted sections, loops, dotted paths and HTML escaping. Live preview, no eval, runs entirely in your browser.
• INI ⇄ JSON Converter — Convert INI / config-file text to JSON and back. Supports sections, comments, top-level keys and basic type inference. Runs entirely in your browser.
• Test Card Number Generator — Generate Luhn-valid test credit card numbers for Visa, Mastercard, Amex, Discover, JCB and Diners — for QA only — and validate or identify any number. Browser-only.
• robots.txt Generator — Generate a robots.txt from user-agent groups, allow and disallow rules, crawl-delay and sitemap URLs. Live preview, runs entirely in your browser.
• JSON-LD Generator — Generate schema.org JSON-LD structured data for Article, Product, FAQ, LocalBusiness, Event and BreadcrumbList, ready to paste into a script tag for SEO rich results.
• .editorconfig Generator — Build an .editorconfig file: set root, indent style/size, end-of-line, charset, trailing whitespace and final newline per glob pattern. Live preview, browser-only.
• CSV Column Statistics — Paste CSV or TSV and get per-column statistics: count, mean, median, min, max, sum and standard deviation for numbers; distinct count and top value for text. Browser-only.
• Histogram Builder — Paste a list of numbers and get a histogram with adjustable bins plus summary statistics (count, min, max, mean, standard deviation). Runs entirely in your browser.
• Ascii85 / Base85 Encoder — Encode and decode text with the Adobe Ascii85 (Base85) alphabet used in PDF and PostScript, with optional <~ ~> framing and z shorthand for zero groups. Browser-only.
• ISO Week & Date Facts — Find the ISO-8601 week number for any date, plus the day of year, days remaining, quarter, weekday, the Monday that starts the week, and leap-year status. Browser-only.
• Duration Sum & Timesheet — Add up a list of durations in mixed formats (1:30:00, 90m, 1h 30m, 1.5h, plain minutes) with plus/minus signs. Get the total as H:MM:SS and decimal hours. Browser-only.
• HTML Beautifier & Minifier — Beautify (re-indent) or minify HTML in your browser. Preserves the contents of pre, script, style and textarea. No upload — everything runs locally.
• XML Formatter & Minifier — Pretty-print or minify XML with indentation and tag-balance checking. Preserves CDATA, comments and processing instructions. Runs entirely in your browser.
• CSV → Markdown Table — Convert CSV or TSV into a GitHub-flavoured Markdown table or an HTML table, with column alignment and optional pretty-padding. Quoted fields supported. Browser-only.
• Markdown → JIRA / Confluence / Slack — Convert Markdown into JIRA wiki markup, Confluence wiki markup, or Slack mrkdwn — headings, bold/italic, lists, links, quotes, code blocks and strikethrough. Browser-only.
• UUID v5 Generator — Generate deterministic name-based UUID v5 values from a namespace UUID and a name using SHA-1, per RFC 9562/4122. Includes the standard DNS, URL, OID and X.500 namespaces.
• Hashids Encoder / Decoder — Encode integers into short, salted, reversible, URL-safe strings (YouTube-style IDs) and decode them back, with configurable salt and minimum length. Browser-only.
• JSON → XML Converter — Convert JSON to indented XML. Object keys become elements, arrays repeat their element, @-prefixed keys become attributes and #text sets element text. Browser-only.
• Phone Number Formatter — Normalize a phone number into E.164, international and national formats for a chosen country, stripping trunk prefixes and punctuation. Runs entirely in your browser.
• Color Shades & Tints Scale — Generate a Tailwind-like 50–950 colour scale (tints and shades) from a single base colour, with readable labels, click-to-copy hex and a config block. Browser-only.
• Bitrate & File Size Calculator — Estimate a video file's size from its bitrate and duration, or compute the bitrate needed to hit a target file size. Accounts for a separate audio track. Browser-only.
• JSON5 / JSONC → JSON — Convert lenient JSON (with comments, trailing commas, single quotes and unquoted keys) into strict, valid JSON. Great for cleaning up config files. Runs entirely in your browser.
• CSV Transpose — Transpose CSV or TSV data — swap rows and columns — with quoted-field support and auto delimiter detection. Runs entirely in your browser.
• .properties ⇄ JSON — Convert Java .properties files to JSON and back, handling comments, key:value or key=value, line continuations and unicode escapes. Runs entirely in your browser.
• Fixed-Width → CSV / JSON — Parse fixed-width column text into CSV or JSON by specifying column widths and names. Useful for mainframe and legacy report data. Runs entirely in your browser.
• Quoted-Printable Encoder — Encode and decode quoted-printable (RFC 2045) text — the email content-transfer encoding with =XX escapes and soft line breaks. UTF-8 safe. Runs entirely in your browser.
• Data URI Generator — Turn text, SVG, HTML or CSS into a data: URI using base64 or percent-encoding, with a ready CSS background snippet and live preview. Runs entirely in your browser.
• Glob → Regex Tester — Convert a shell-style glob (*, **, ?, [set], {a,b}, ! negation) to a regular expression and test it against a list of file paths. Runs entirely in your browser.
• Smart Quotes & Typography — Convert straight quotes to curly typographic quotes, fix dashes (en/em) and ellipses — or reverse it back to plain ASCII. Great for polishing prose. Runs entirely in your browser.
• Braille Translator — Translate text to Unicode Braille (Grade 1, uncontracted) and back — letters, digits and common punctuation, with capital and number indicators. Runs entirely in your browser.
• Pluralize / Singularize — Convert English words between singular and plural, with rules for -y, -es, -ves and a dictionary of irregulars and uncountables. Handy for naming. Runs entirely in your browser.
• Cheque Writer (amount in words) — Spell a monetary amount in words for writing a cheque, e.g. 1234.50 → One Thousand Two Hundred Thirty-Four and 50/100. Runs entirely in your browser.
• Sales Tax / VAT Calculator — Add sales tax/VAT to a net price, or extract the tax already included in a gross price, at any rate. Shows net, tax and gross. Runs entirely in your browser.
• Proportion Solver — Solve a proportion a/b = c/d (the rule of three): leave one field blank and get the missing value via cross-multiplication. Runs entirely in your browser.
• Weighted Average Calculator — Compute a weighted mean from value/weight pairs — for GPAs, weighted scores or blended rates — plus the plain average for comparison. Runs entirely in your browser.
• PIN Generator — Generate random numeric PINs (3–12 digits) using the browser crypto RNG, optionally avoiding weak patterns like 1234, 0000, repeats and sequences. Runs entirely in your browser.
• CSS Triangle Generator — Generate a pure-CSS triangle using the border trick — choose direction, size and colour, preview it live and copy the CSS. Runs entirely in your browser.
• CSS Text-Shadow Generator — Build a CSS text-shadow with multiple stacked layers (offset, blur, colour), preview it live and copy the CSS. Includes neon, outline and retro presets. Runs entirely in your browser.
• CSS Filter Playground — Experiment with CSS filter() — blur, brightness, contrast, grayscale, hue-rotate, invert, saturate and sepia — with a live preview and copyable CSS. Runs entirely in your browser.
• Custom Scrollbar CSS — Design a custom scrollbar and copy the CSS — WebKit ::-webkit-scrollbar rules plus the standard scrollbar-width and scrollbar-color. Live preview. Runs entirely in your browser.
• Font Stack Builder — Build a robust CSS font-family stack from your primary fonts plus a system, sans, serif or mono fallback chain, with correct quoting. Live preview. Runs entirely in your browser.
• Pixel Sorter — Create glitch art by sorting runs of pixels by brightness within a threshold band, horizontally or vertically. The classic ASDFPixelSort effect — runs entirely in your browser.
• Glitch Studio — Add a glitch/datamosh look to any image: RGB channel shift, random slice displacement and CRT scanlines, with a randomize button. Runs entirely in your browser.
• Halftone Generator — Turn a photo into a halftone dot pattern — variable-size dots on a rotated grid, mono or colour, the classic print/comic look. Runs entirely in your browser.
• Low-Poly Art Generator — Turn a photo into low-poly triangle art: edge-weighted point sampling, Delaunay triangulation and per-triangle colour. Adjust detail and regenerate. Runs entirely in your browser.
• Duotone Generator — Apply a Spotify-style duotone effect: map image shadows and highlights to two colours, with presets and custom pickers. Runs entirely in your browser.
• Edge Detection — Detect edges in an image with the Sobel operator — adjustable threshold and invert for a blueprint or pencil-sketch look. Runs entirely in your browser.
• Convolution Kernel Lab — Apply a custom 3×3 convolution kernel to an image — blur, sharpen, emboss, edge and outline presets, or edit the matrix yourself. Live preview, runs entirely in your browser.
• Seam Carving — Shrink an image without distorting its subject using seam carving (content-aware resizing) — it removes low-energy seams found by dynamic programming. Runs entirely in your browser.
• Kaleidoscope — Turn any image into a kaleidoscope with mirrored radial segments — adjust the number of wedges and rotation for endless symmetric patterns. Runs entirely in your browser.
• Chroma Key (green screen) — Remove a green/blue screen (or any colour) to transparency with adjustable tolerance, soft edges and spill suppression. Click to pick the key colour. Exports a transparent PNG.
• Fourier Epicycles — Draw any closed shape and watch a chain of rotating circles (its discrete Fourier transform) redraw it — the famous epicycle visualization. Runs entirely in your browser.
• Strange Attractors — Render mesmerizing strange attractors — Clifford, De Jong and the Lorenz system — as glowing point clouds. Tweak parameters or randomize, then export a PNG. Browser-only.
• Elementary Automata — Explore all 256 elementary cellular automata, including chaotic Rule 30 and Turing-complete Rule 110. Choose a rule, seed and zoom, then export the triangle. Browser-only.
• Chaos Game Fractals — Watch iterated function systems draw the Barnsley fern and Sierpinski fractals by the chaos game — random points converging to self-similar shapes. Runs entirely in your browser.
• Boids Flocking — A live boids flocking simulation — separation, alignment and cohesion produce emergent murmurations. Tune the forces and flock size. Runs entirely in your browser.
• Double Pendulum — An RK4-integrated double pendulum that traces beautiful chaotic trails. Adjust masses and lengths, pause, and watch deterministic chaos unfold. Runs entirely in your browser.
• Falling Sand — A falling-sand cellular automaton sandbox: paint sand, water, walls and plants and watch them pile, flow and grow. Click and drag to play. Runs entirely in your browser.
• Penrose Tiling — Generate a Penrose P3 tiling — an aperiodic pattern of two rhombi built by golden-ratio subdivision. Adjust depth and colours, then export a PNG. Runs in your browser.
• Wave Function Collapse — Generate connected pipe patterns with Wave Function Collapse — a constraint solver that fills a grid so every neighbour matches. Reroll for new layouts. Runs in your browser.
• Harmonograph — Generate mesmerizing harmonograph curves — the looping figures a multi-pendulum drawing machine traces — from two damped sinusoids per axis. Reroll and export. Browser-only.
• Bionic Reading — Convert any text to a bionic-reading format that bolds the first part of each word to guide your eyes. Adjust the emphasis strength and font size. Runs entirely in your browser.
• Salary / Pay Converter — Convert a pay rate between hourly, daily, weekly, bi-weekly, monthly and annual, based on your hours per week and weeks per year. Runs entirely in your browser.
• Nano ID Generator — Generate compact, URL-safe unique IDs (Nano ID style) with a configurable alphabet and length, using the browser CSPRNG with unbiased sampling. Shows collision risk. Browser-only.
• Citation Generator — Generate citations in APA, MLA, Chicago, Harvard and BibTeX from a few fields, for books, websites and journal articles. Runs entirely in your browser.
• 2FA Backup Codes — Generate sets of random two-factor backup/recovery codes with configurable count, grouping, separators and alphabet, using the browser CSPRNG. Download as a text file. Browser-only.
• VLSM Subnet Planner — Plan variable-length subnet masks: enter a base CIDR and the hosts each subnet needs, and get non-overlapping subnets with network, mask, host range and broadcast. Browser-only.
• vCard Generator — Create a downloadable vCard (.vcf) contact file from a name, organisation, phone, email, address and more — RFC 6350 compliant. Runs entirely in your browser.
• Mailto Link Builder — Build a mailto: link with to, cc, bcc, subject and body, correctly percent-encoded — plus a ready HTML anchor. Test it instantly. Runs entirely in your browser.
• Home Affordability Calculator — Estimate the maximum home price and mortgage you can afford from your income, debts, down payment, interest rate, term and debt-to-income limit. Runs entirely in your browser.
• Color Quantizer — Reduce an image to an optimal N-colour palette with the median-cut algorithm — for posterized, screen-print or retro looks. See the palette and export a PNG. Runs in your browser.
• Pixel Art Upscaler — Upscale pixel art crisply with nearest-neighbour or the edge-preserving EPX/Scale2x algorithm (2× or 4×) — no blurring. Export a PNG. Runs entirely in your browser.
• Photo Filters — Apply one-click photo filters — grayscale, sepia, vintage, noir, warm, cool, vibrant — with an optional vignette, baked into a downloadable PNG. Runs entirely in your browser.
• Capacitor Code Calculator — Decode 3-digit capacitor codes (e.g. 104 = 100 nF) and tolerance letters, or 4n7-style values, into picofarads/nanofarads/microfarads. Runs entirely in your browser.
• BPM Delay Calculator — Calculate note durations and delay times (ms and Hz) for any tempo, including dotted and triplet values — for setting delays, reverbs and LFOs. Runs entirely in your browser.
• PPI Calculator — Calculate a display's pixels-per-inch (PPI), dot pitch, aspect ratio and physical size from its resolution and diagonal screen size. Runs entirely in your browser.
• ROI & CAGR Calculator — Calculate return on investment (ROI), net gain, the growth multiple and the annualized return (CAGR) from an initial value, final value and holding period. Runs entirely in your browser.
• Angle Converter — Convert an angle between degrees, radians, gradians, turns, arcminutes and arcseconds, with sin/cos/tan and the normalized 0–360° value. Runs entirely in your browser.
• Logarithm Calculator — Compute the logarithm of a number to any base (plus ln, log10 and log2) and the antilog (base raised to an exponent), with the change-of-base working. Runs entirely in your browser.
• Remove Accents (Deburr) — Strip accents and diacritics from text (café → cafe), optionally transliterating ligatures (ß → ss, æ → ae) and filtering to ASCII only — great for slugs, filenames and search keys. Runs entirely in your browser.
• Speed · Distance · Time Solver — Solve for speed, distance or time given the other two, mixing metric and imperial units (km/h, mph, knots, miles, nautical miles and more), with a readable duration breakdown. Runs entirely in your browser.
• Zodiac & Birthstone — Enter a birth date to see the Western zodiac sign, Chinese zodiac animal and element, birthstone and birth flower. Runs entirely in your browser.
• Hex Dump Viewer — View a classic hexdump -C style dump of text (UTF-8) or raw hex bytes — offset column, hex columns and an ASCII gutter where non-printable bytes show as dots. Runs entirely in your browser.
• Scientific Notation Converter — Convert a number between plain decimal, scientific notation (a × 10ⁿ), engineering notation (exponent a multiple of 3) and E-notation, with adjustable significant figures. Runs entirely in your browser.
• Temperature Converter — Convert a temperature between Celsius, Fahrenheit, Kelvin, Rankine and Réaumur, all at once, with an absolute-zero sanity check. Runs entirely in your browser.
• Caesar Cipher & ROT13 — Encode and decode text with a Caesar shift cipher (any shift), ROT13 and ROT47, plus a brute-force panel showing all 26 possible decodings. Runs entirely in your browser.
• Wavelength ↔ Frequency — Convert between wavelength and frequency of an electromagnetic wave (c = λf), with photon energy in joules and eV and the EM spectrum band. Runs entirely in your browser.
• Change Maker — Break an amount of money into the fewest coins and notes for USD, EUR, AUD or GBP, using a greedy or exact-minimum algorithm. Runs entirely in your browser.
• Vigenère Cipher — Encrypt and decrypt text with the classic Vigenère polyalphabetic cipher using a repeating keyword. Case is preserved and punctuation passes through. Runs entirely in your browser.
• Paper Size Reference — Dimensions of ISO 216 (A, B, C series) and North American paper sizes (Letter, Legal, Tabloid) in millimetres, inches and pixels at any DPI. Runs entirely in your browser.
• Shoe Size Converter — Convert shoe sizes between US, UK, EU and centimetre (foot length) systems for men and women, with Brannock-based approximations. Runs entirely in your browser.
• Numeronym Generator — Turn words into numeronyms by keeping the first and last letters and counting the omitted middle ones — internationalization → i18n, accessibility → a11y. Runs entirely in your browser.
• Random Port Generator — Generate random TCP/UDP port numbers in a chosen range, avoiding well-known system ports and common dev ports so they're unlikely to clash. Runs entirely in your browser.
• String Obfuscator — Mask the middle of a sensitive string (API key, token, card number or email) keeping a few characters visible, so you can share or screenshot it safely. Runs entirely in your browser.
• Text Sorter & Dedupe — Sort lines (alphabetical, natural, numeric, length, or random shuffle), remove duplicates, trim whitespace, drop blanks and reverse — in one pass, with live counts.
• Color Mixer — Blend two colours at any ratio with gamma-correct linear-light mixing, generate a stepped blend, and pull out tints and shades. Click any swatch to copy the hex.
• Random Number Generator — Cryptographically secure random integers, decimals, dice rolls and coin flips. Generate many at once, with an optional no-repeats draw for raffles. Unbiased, no modulo skew.
• Map Studio — A full mapping workbench: search places, draw markers, lines, polygons and circles, measure distance and area, import/export GeoJSON, and share a link. Six basemaps, no API key.
• Air Quality Monitor — Live US AQI for any city with a colour-coded health band, the dominant pollutant, a PM2.5/PM10/O₃/NO₂/SO₂/CO breakdown, and a 24-hour trend. Save several locations. Open-Meteo, no key.
• Wikipedia Trending — The day's most-read Wikipedia articles by pageviews, with thumbnails and summaries. Ten language editions, any date, searchable. Powered by the Wikimedia REST feed.
• Crypto Fear & Greed Index — The crypto market's sentiment gauge (0–100) with storm-band colours, change vs yesterday/week/month, and a 90-day history you can scrub. Data from alternative.me, no key.
• Space Weather & Aurora — Live geomagnetic activity: the planetary Kp index with NOAA storm level, a 3-day Kp forecast, and real-time solar wind (Bz, speed, density). See when the aurora might appear. NOAA SWPC.
• Dictionary — Look up any English word: definitions by part of speech, phonetic spelling with audio pronunciation, examples, and clickable synonyms and antonyms. Free Dictionary API, no key.
• Book Finder — Search millions of books by title, author or keyword. Covers, first-publish year, edition counts and reader ratings, sortable, with click-through to Open Library.
• Country Explorer — Browse every country: flags, capitals, population, area, currencies, languages, timezones and neighbours you can jump between. Filter by region, search and sort. REST Countries data.
• Recipe Search — Find recipes by name or browse by category and world cuisine. Full ingredient lists with measures, step-by-step method, and a how-to video link. Powered by TheMealDB, no key.
• Food Facts — Look up a packaged food by barcode: Nutri-Score, NOVA processing group, Eco-Score, a per-100g nutrition table and the ingredient list. Open Food Facts data, no key.
• Art Explorer — Search The Met's open-access collection — paintings, sculpture, armor, prints and more — with high-resolution images and full catalogue details. No API key.
• Car Brand Explorer — Browse major car brands with country, founding year, parent group, segment and notable facts. Open a brand for a live model list, or decode any VIN — powered by the free NHTSA database.
• UTC Time — Live UTC clock with your local time and offset, an instant UTC ⇄ local converter, every format (ISO 8601, RFC 2822, Unix seconds/ms), and a DST-aware world clock. Runs in your browser.
• Image Watermark — Stamp a text or logo watermark onto a photo — position, opacity, size, rotation, colour and tiling — then export PNG or JPEG. Pure browser; the image never leaves your device.
• Meme Generator — Drop an image and add classic Impact-style top/bottom captions with a bold outline. Drag captions anywhere, tune size and colour, export a PNG. Runs entirely in your browser.
• Signature Pad — Draw your signature with mouse, trackpad or touch and export a transparent PNG, white PNG, or SVG. Smooth strokes, adjustable pen, undo. Nothing is uploaded.
• Image to PDF — Combine JPG, PNG and WebP images into a single PDF, one image per page. Choose page size, orientation and margins, reorder pages, and download. Pure browser, nothing uploaded.
• Photo Collage — Arrange photos into a grid collage: adjustable columns, gap, padding, background, corner radius and cell shape. Centre-cropped cells, export PNG or JPEG. Runs in your browser.
• Image Redactor — Hide faces or sensitive details — drag boxes to pixelate, blur or black them out. The redaction is baked into the exported pixels. Pure browser; nothing is uploaded.
• Invoice Generator — Build a clean, professional invoice: line items, tax, discount, currency, logo and notes with live totals. Print or save as PDF, export/import JSON. No account, runs locally.
• Metronome — A precise Web Audio metronome: adjustable BPM, time signatures with an accented downbeat, tap tempo, and a visual beat indicator. Synthesized clicks, runs in your browser.
• Instrument Tuner — Chromatic mic tuner — play a note and see the pitch with a ±50-cent needle. Tune guitar, bass, violin, ukulele or your voice. Adjustable reference A. Audio is never recorded.
• Speech to Text — Dictate with your voice and watch it transcribe live. 15 languages, continuous mode, interim results, word count, copy and download. Uses your browser's speech recognition.
• Email Signature Generator — Build a professional HTML email signature with logo, accent colour and social links. Live preview, one-click copy into Gmail / Outlook / Apple Mail, and raw HTML export.
• SVG to JSX — Paste SVG markup and get a clean React component: camelCased attributes, style objects, JSX comments, optional TypeScript, {...props} and React.memo. Runs in your browser.
• Voice Recorder — Record from your microphone with a live waveform and timer, play it back, and download as WebM or WAV. No account, no upload — everything stays in your browser.
• Webcam Photo Booth — Take webcam photos with live filters, a mirror toggle and a 3-2-1 countdown. Capture single shots or a 4-frame strip and download as PNG. Nothing is uploaded.
• CSS Loader Generator — A gallery of pure-CSS loading spinners. Pick a style, tune size, colour and speed, then copy ready-to-paste HTML and CSS. No images, no JavaScript, no dependencies.
• Mesh Gradient Generator — Build trendy multi-point mesh gradients from stacked CSS radial-gradients. Drag colour points, randomize palettes, copy the pure-CSS background or export a PNG. Runs entirely in your browser.
• Blob Generator — Generate smooth, organic SVG blob shapes for backgrounds, avatars and dividers. Tune points and randomness, reshuffle the seed, recolour with gradients, then copy SVG / path / clip-path or download SVG/PNG.
• HTML Table Extractor — Paste HTML and pull every <table> out as clean CSV, JSON or Markdown. Pick a table, preview it, then copy or download. Parses in your browser with DOMParser — nothing is uploaded.
• Background Pattern Generator — Create seamless repeating SVG background patterns — dots, grids, lines, triangles, crosses and waves. Tune colours, scale and stroke, then copy the CSS background or download the SVG tile. Pure SVG, runs in your browser.
• Image Pixelate — Turn any image into pixel art or a mosaic. Adjust block size, posterize the palette, go grayscale and show grid lines, then download a PNG. Runs entirely on a canvas — nothing is uploaded.
• Word Cloud Generator — Paste text and generate a clean, non-overlapping word cloud. Frequencies drive font size, stop-words are filtered, tune rotation and palette, reshuffle the layout and download a PNG. Runs in your browser.
• Magic Eye Generator — Turn any word into a single-image stereogram (Magic Eye). Hidden 3D text appears when you diverge your eyes. Tune depth and pattern width, pick random or coloured dots, then download a PNG. Runs in your browser.
• Image Dithering — Give any image a retro look — 1-bit, Game Boy, CGA or amber CRT — with Floyd–Steinberg error diffusion or ordered Bayer dithering. Tune contrast and resolution, then download a PNG. Runs entirely in your browser.
• Spirograph Studio — Draw mesmerising spirograph curves — hypotrochoids and epitrochoids. Tune the ring, gear and pen offset, watch it animate with a colour cycle, then export SVG or PNG. Pure maths on canvas, in your browser.
• Image Resizer — Resize any image to exact pixel dimensions or a percentage, with optional aspect-ratio lock. Export as PNG, JPEG or WebP with adjustable quality and see the output size. Runs entirely in your browser — nothing is uploaded.
• List Compare — Paste two lists and compute union, intersection, difference or symmetric difference, plus find duplicates. Configurable case and whitespace handling. Copy or download the result. Runs entirely in your browser.
• Number to Words — Convert any number to words — cardinal, ordinal and cheque/currency forms. Handles negatives and decimals, with multiple currencies and one-tap copy. Great for invoices and contracts. Runs in your browser.
• CSV SQL Query — Paste CSV and query it with real SQL — SELECT, WHERE, GROUP BY, ORDER BY, LIMIT and aggregates (COUNT/SUM/AVG/MIN/MAX). A hand-written engine runs entirely in your browser and exports results to CSV. No upload.
• Background Remover — Click an image background to erase it with a magic-wand flood fill. Adjustable tolerance, contiguous or global mode, undo, and transparent PNG export. Runs entirely on a canvas in your browser — nothing is uploaded.
• TSP Solver — Drop cities and watch a travelling-salesman tour optimise live — a nearest-neighbour route refined by animated 2-opt. Shows tour length and improvement over the greedy start. Runs entirely in your browser.
• Recurrence (RRULE) Expander — Paste an iCalendar RRULE and a start date to preview the next occurrences with a plain-English summary. Supports FREQ, INTERVAL, COUNT, UNTIL, BYDAY, BYMONTHDAY and BYMONTH. Runs entirely in your browser.
• Huffman Coding — Type text and build an optimal Huffman prefix code: per-symbol codes, the encoded bit string, a tree diagram and compression stats vs fixed-width and raw bytes. Runs entirely in your browser.
• Boolean Minimizer — Simplify Boolean functions with Quine–McCluskey. Enter minterms and don't-cares (or toggle a truth table) and get the minimal sum-of-products expression plus prime implicants, verified against the truth table. Runs in your browser.
• Matrix Calculator — Add, subtract, multiply, scalar-multiply, transpose, and compute the determinant or inverse of matrices. Enter rows on separate lines and compute instantly. Runs entirely in your browser.
• Check Digit Validator — Validate check digits for credit cards and IMEI (Luhn), ISBN-10, ISBN-13 / EAN-13 and IBAN (mod-97). See whether an identifier is valid and the expected check digit. Runs entirely in your browser.
• Coordinate Converter — Convert latitude/longitude between decimal degrees and DMS, and measure great-circle distance and bearing between two points with the haversine formula. Runs entirely in your browser.
• Equation Solver — Solve linear, quadratic and cubic equations for their real and complex roots in closed form. Enter coefficients and see the roots instantly. Runs entirely in your browser.
• Fraction Calculator — Add, subtract, multiply and divide fractions with exact results in lowest terms, as a mixed number and decimal. Accepts mixed numbers, decimals and repeating decimals like 0.(3). Runs in your browser.
• Business Day Calculator — Count working days between two dates, or add/subtract business days from a date, skipping weekends and custom holidays. Great for deadlines and SLAs. Runs entirely in your browser.
• CRC / Checksum Calculator — Compute CRC-32, CRC-16/CCITT, CRC-16/MODBUS, Adler-32 and simple checksums over text or hex bytes. Verified against standard test vectors. Runs entirely in your browser.
• Hamming(7,4) Code — Encode 4 data bits into a 7-bit Hamming codeword, then flip any bit to watch the syndrome locate and correct a single-bit error. An interactive demo of error-correcting codes. Runs in your browser.
• Random Group Generator — Paste names and split them into balanced groups or groups of a fixed size. Reproducible seeded shuffle with one-tap copy. Great for teams, breakout rooms and pair programming. Runs in your browser.
• Soundex & Metaphone — Encode names and words to their Soundex and Metaphone phonetic keys to find ones that sound alike. Paste a list to see phonetic matches grouped. Runs entirely in your browser.
• Tax Bracket Calculator — Enter an income and progressive tax brackets to see tax owed, a per-bracket breakdown, and your marginal versus effective rate. Includes US and Australian presets. Educational, runs in your browser.
• Day of the Week — Find the weekday for any date, past or future, using Zeller's congruence. Also shows leap-year status, day of year, ISO week and the weekday in coming years. Runs entirely in your browser.
• Loan Amortization Schedule — Compute a loan's level payment, total interest and full amortization schedule with the principal/interest split. Add extra payments to see interest and time saved. Runs entirely in your browser.
• Combinatorics Calculator — Compute exact permutations (nPr), combinations (nCr) and factorials — with and without repetition — using BigInt for large values. Includes a Pascal's-triangle row. Runs entirely in your browser.
• Triangle Solver — Solve any triangle from 3 known values (SSS, SAS, ASA, AAS, SSA) using the laws of sines and cosines. Get all sides, angles, area and perimeter with a scaled drawing. Runs entirely in your browser.
• Vector Calculator — Compute vector operations for 2D and 3D vectors — sum, difference, dot and cross products, magnitude, distance, angle, normalisation and projection. Runs entirely in your browser.
• Color Temperature — Convert a colour temperature in Kelvin to its approximate sRGB colour (black-body radiator). Slide through the spectrum, pick lighting references, and copy the hex or CSS. Runs entirely in your browser.
• Ohm's Law Calculator — Enter any two of voltage, current, resistance and power and get the other two (V=IR, P=VI), with SI-prefixed results. Runs entirely in your browser.
• Truth Table Generator — Type a boolean expression with AND/OR/NOT/XOR/IMPLIES/IFF (word or symbolic) and get the full truth table, minterms and tautology/contradiction status. Runs entirely in your browser.
• Linear Regression — Paste (x, y) points and fit a least-squares line. See the equation, R², correlation and a scatter plot with the fitted line, and predict new values. Runs entirely in your browser.
• Polynomial Calculator — Add, subtract and multiply polynomials, and find the derivative, integral and value of one. Enter expressions like 2x^2 - 3x + 1 or coefficient lists. Runs entirely in your browser.
• Big Number Calculator — Exact integer arithmetic on numbers of any size — add, subtract, multiply, divide (quotient + remainder), modulo, power, gcd, lcm, factorial and base conversion. BigInt-backed, runs in your browser.
• Unit Price Comparison — Compare products of different package sizes by price per unit (per 100g, per ml, per item) to find the best value. Supports mass, volume, length and count units. Runs entirely in your browser.
• Shortest Path (Dijkstra) — Paste a weighted edge list and find the shortest path between two nodes with Dijkstra's algorithm. Directed or undirected, with a graph diagram and per-node distances. Runs entirely in your browser.
• Fancy Text Generator — Turn text into fancy Unicode styles — bold, italic, script, monospace, small caps, full-width, upside-down, leetspeak, strikethrough and underline. Tap to copy. Runs entirely in your browser.
• Complex Number Calculator — Add, subtract, multiply and divide complex numbers, and get the modulus, argument, conjugate and polar form. Enter values like 3+4i or 2-3i. Runs entirely in your browser.
• Run-Length Encoding — Encode text with run-length encoding (aaabbc → 3a2b1c) and decode it back, with live compression statistics. A classic lossless compression demo. Runs entirely in your browser.
• Base58 & Base32 Encoder — Encode and decode text or hex bytes with Base58 (Bitcoin alphabet) or Base32 (RFC 4648). Leading-zero-safe Base58. Runs entirely in your browser.
• Discount Calculator — Calculate the sale price after one or more stacked percentage discounts plus tax, see the savings and effective discount, or reverse a sale price to the original. Runs entirely in your browser.
• Collatz Conjecture — Explore the 3n+1 conjecture: enter any positive integer and see its trajectory to 1, with the number of steps, the peak value, a chart and the full sequence. Runs entirely in your browser.
• N-Queens Solver — Solve the N-Queens puzzle: count all ways to place N non-attacking queens on an N×N board and browse sample solutions on an interactive board. Runs entirely in your browser.
• Prime Generator — Generate prime numbers with the Sieve of Eratosthenes — list primes up to a limit, count them (π(n)), find the nth prime, list twin primes, or test a number. Runs entirely in your browser.
• Fibonacci & Golden Ratio — Compute the nth Fibonacci and Lucas numbers exactly (BigInt), list the sequence, test whether a number is Fibonacci, and watch the ratio converge to the golden ratio φ. Runs in your browser.
• Color Name Finder — Enter a hex or rgb() colour and find the closest CSS named colour by perceptual (Lab) distance, with exact-match detection and nearby alternatives. Runs entirely in your browser.
• Continued Fraction — Expand any decimal or fraction into its continued-fraction coefficients and list the convergents — the best rational approximations (like 22/7 and 355/113 for π) with their error. Runs in your browser.
• Numerical Integration — Compute a definite integral of f(x) over [a, b] with Simpson's and the trapezoid rule and see the area under the curve. Supports sin, cos, exp, ln, sqrt and more. Runs entirely in your browser.
• Ideal Weight Calculator — Estimate ideal body weight from height and sex using the Devine, Robinson, Miller and Hamwi formulas, plus a BMI-based healthy weight range. Educational, runs entirely in your browser.
• Timecode Calculator — Convert SMPTE timecode to and from frames and seconds at any frame rate, and add or subtract timecodes. Drop-frame supported for 29.97 and 59.94 fps. Runs entirely in your browser.
• Ratio & Proportion Solver — Simplify a ratio to lowest terms, solve a proportion a:b = c:x, and split a total by a ratio. Works with two or more parts and decimals. Runs entirely in your browser.
• Magic Square Generator — Generate a magic square of any order where every row, column and diagonal sums to the same constant. Handles odd, doubly-even and singly-even sizes. Runs entirely in your browser.
• GCD & LCM Calculator — Compute the greatest common divisor and least common multiple of a list of integers with exact BigInt arithmetic, plus each number's prime factorisation. Runs entirely in your browser.
• Text to Binary Converter — Convert text to and from binary, decimal and hexadecimal byte codes (UTF-8). Encode any string or decode codes back to text, with automatic base detection. Runs entirely in your browser.
• TDEE & Calorie Calculator — Estimate your BMR and total daily energy expenditure from height, weight, age, sex and activity, set a goal, and split target calories into carbs, protein and fat. Educational, runs in your browser.
• Margin & Markup Calculator — Work out cost, selling price, profit, gross margin % and markup % from whichever pair you know. A quick pricing and profit calculator. Runs entirely in your browser.
• Normal Distribution Calculator — Compute the probability density, cumulative probability, z-score and percentiles of a normal distribution, with a shaded bell-curve plot. Runs entirely in your browser.
• Linear System Solver — Solve systems of 2 or 3 linear equations with Cramer's rule, detecting unique, no, or infinitely many solutions. Runs entirely in your browser.
• Binomial Distribution Calculator — Compute binomial probabilities P(X=k), P(X≤k) and P(X≥k) for n trials with success probability p, plus the mean and variance, with a PMF bar chart. Runs entirely in your browser.
• Whitespace Cleaner — Detect and remove zero-width characters, non-breaking spaces, tabs and trailing whitespace, normalise line endings and collapse blank lines. Reveal invisible characters. Runs entirely in your browser.
• Poisson Distribution Calculator — Compute Poisson probabilities P(X=k), P(X≤k) and P(X≥k) for an average rate λ, plus the mean and variance, with a PMF bar chart. For modelling rare events and arrivals. Runs in your browser.
• Pig Latin Translator — Translate English text into Pig Latin, preserving capitalisation and punctuation. Handles consonant clusters, leading vowels, 'y' and 'qu'. Runs entirely in your browser.
• Root Finder — Find the roots of any function f(x) over an interval using sign-change bracketing and bisection, with the function plotted and roots marked. Runs entirely in your browser.
• Confidence Interval Calculator — Build a z-based confidence interval for a population mean or proportion from sample statistics, and find the sample size for a target margin of error. Runs entirely in your browser.
• Word Frequency Counter — Count the most frequent words and two-word phrases in any text, with optional stop-word removal and a minimum length filter. Shows counts and percentages. Runs entirely in your browser.
• Break-Even Calculator — Find your break-even point in units and revenue from fixed costs, price and variable cost per unit, with the contribution margin and a cost-vs-revenue chart. Runs entirely in your browser.
• Title Case Converter — Convert headings to proper title case (AP/Chicago style — short articles, conjunctions and prepositions stay lowercase) or sentence case. Runs entirely in your browser.
• Permutations & Combinations — List every permutation or combination (with or without repetition) of a set of items, with the exact total count. Runs entirely in your browser.
• APR ⇄ APY Converter — Convert a nominal annual rate (APR) compounded n times a year to the effective annual yield (APY) and back, including continuous compounding, and see how a balance grows. Runs in your browser.
• Base32 Encoder / Decoder — Encode text to Base32 and decode it back, using the standard RFC 4648 alphabet or the extended-hex base32hex alphabet. Optional padding and a hex byte preview. Runs entirely in your browser.
• Modular Exponentiation Calculator — Compute base^exponent mod m with exact BigInt arithmetic, plus the modular inverse and multiplicative order of the base. Handles huge numbers and negative exponents. Runs entirely in your browser.
• Tally Counter — Keep any number of named counters with custom step sizes for reps, laps, inventory or head counts. Big tap targets and counts that auto-save in your browser. No account, no tracking.
• Regex Explainer — Paste a regular expression and get a clear, token-by-token explanation in plain English: groups, character classes, anchors, quantifiers, lookarounds and flags. Runs entirely in your browser.
• Pascal's Triangle Explorer — Generate Pascal's triangle with exact BigInt binomial coefficients. Highlight odd entries to reveal the Sierpiński triangle, or colour multiples of any divisor. Runs entirely in your browser.
• Number Sequence Solver — Enter the first terms of a sequence and find the pattern — arithmetic, geometric, polynomial or a Fibonacci-like recurrence — with the formula and predicted next terms. Runs entirely in your browser.
• Image Vectorizer — Trace any PNG, JPG or WebP into clean, layered SVG vector art — median-cut color tracing with marching-squares contours and curve smoothing. Nothing is uploaded; copy or download the SVG.
• Spring Animation Designer — Design natural motion with real mass-spring-damper physics. Tune stiffness, damping and mass, preview live, and copy CSS @keyframes or Framer Motion config.
• Smooth Shadow Generator — Layer multiple box-shadows along an easing falloff to mimic real diffuse light. Tune depth, color and intensity, preview on a card, and copy clean CSS.
• Tone Generator & Binaural Beats — Generate pure tones at any frequency, binaural beats for focus or relaxation, and exponential frequency sweeps to test speakers — live with Web Audio. Headphones recommended for binaural mode.
• JSON to Zod Schema — Paste JSON and get a typed Zod schema with an inferred TypeScript type. Merges arrays of objects, detects optional and nullable fields, and can collapse string arrays into z.enum.
• SVG Wave Generator — Create smooth, layered SVG wave dividers for section breaks and hero backgrounds. Tune amplitude, complexity and layers, reseed for new shapes, and copy the SVG or a CSS background.
• Noise Texture Generator — Add tasteful film grain to backgrounds with SVG feTurbulence, encoded as a CSS data-URI — no image asset to host. Tune frequency, detail, opacity and blend mode, then copy the CSS.
• Pixel Art Studio — Draw sprites pixel by pixel with pencil, flood fill, eraser and eyedropper on an 8–32px grid. Undo, a classic 16-color palette, and crisp scaled PNG export. Saved locally.
• Sprite Sheet Slicer — Slice a sprite sheet into frames by grid count or tile size, preview the animation at any FPS, and download individual frames as PNGs. The image never leaves your browser.
• Breathing Coach — A guided breathing timer with an animated orb for box breathing, 4-7-8, coherent breathing and custom rhythms, with an optional cue tone. A calm relaxation aid in your browser.
• Six Thinking Hats — Think through a decision from six angles — facts, feelings, caution, benefits, creativity and process — with per-hat notes, a focus timer, and Markdown export. de Bono's parallel-thinking method.
• SWOT Analysis — Map strengths, weaknesses, opportunities and threats in a clean 2×2 board with guiding prompts, then export Markdown. Saved locally in your browser.
• Idea Spark — Break a mental block with random creative provocations, domain mashups, arbitrary constraints and 'what if' reframings. Pin the sparks you like. No AI — just lateral thinking.
• Interval Timer (HIIT) — A configurable HIIT / Tabata timer with work and rest rounds, a prep countdown, audio cues and a visual phase ring. Presets for Tabata, 30/15 HIIT and EMOM.
• Unit Circle Explorer — Drag around the unit circle to read sine, cosine and tangent, the angle in degrees and radians, the quadrant, and exact values at the special 30/45/60° angles. An interactive trig aid.
• Water Intake Calculator — Estimate a daily water target from your weight, activity level and climate. Shows litres, cups and fluid ounces plus a glass-by-glass breakdown. Metric or imperial.
• Coin Flip — Flip one or many fair coins with cryptographically random results. Tracks running heads/tails totals, percentages and the longest streak.
• Yes / No Oracle — Can't decide? Ask the oracle and get a cryptographically random verdict — yes, no, or maybe — with a Magic-8-Ball-style phrase.
• Leetspeak Translator — Translate text into leetspeak (l33t) at light, medium or heavy intensity, or decode l33t back to plain text.
• One-Rep Max Calculator — Estimate your 1RM from a submaximal set using the Epley, Brzycki, Lombardi, O'Conner and Lander formulas, with a working-set percentage table.
• .gitattributes Generator — Toggle common rules — normalized line endings, binary handling, Git LFS tracking, GitHub Linguist overrides and export-ignore — and copy a ready .gitattributes file.
• CSS Unit Converter — Convert CSS lengths between px, rem, em, pt and percent with configurable root, parent and reference font sizes. See every unit at once.
• Reading Time Estimator — Paste text for word, character, sentence and paragraph counts plus estimated reading and speaking times at adjustable words-per-minute speeds.
• CSS Line-Clamp Generator — Generate the -webkit-line-clamp CSS to truncate text to a set number of lines with an ellipsis, with a live preview. Copy the snippet.
• Random Bytes Generator — Generate cryptographically secure random bytes and view them as hex, Base64, Base64URL, binary, a byte array or decimal. Built on the Web Crypto API.
• Birthday Paradox Calculator — Compute the probability that two people in a group share a birthday — the famous result where just 23 people give 50%. Solve for any group size or target probability.
• GPA Calculator — Calculate your grade point average on the 4.0 scale from letter grades and credit hours. Add courses to see your weighted GPA and total credits. Saved locally.
• UUIDv7 Generator — Generate time-ordered UUIDv7 values (RFC 9562): a millisecond timestamp plus random bits, so they sort chronologically — ideal as database primary keys.
• Coffee Ratio Calculator — Dial in coffee and water from a brew ratio. Lock the dose or the water and the other follows, with presets for pour-over, French press, AeroPress, espresso and cold brew.
• CSS clip-path Generator — Drag polygon vertices over a live preview or pick circle/ellipse/inset shapes, then copy the clip-path CSS. Presets for triangles, stars, arrows and more.
• CSS Transform Playground — Compose translate, rotate, scale, skew and 3D rotateX/Y with perspective, watch a live preview, and copy the CSS.
• CSS Text Gradient — Create gradient-filled text with background-clip: text. Tune colors, angle and sample text, preview live, and copy the CSS.
• Neon Text Generator — Build glowing neon-sign text with layered CSS text-shadow. Tune color, glow size and intensity, preview on a dark backdrop, and copy the CSS.
• SQL IN-Clause Builder — Turn a pasted list into a SQL IN(...) clause with proper quoting and escaping, dedupe, sort, column wrapping and number auto-detection.
• JSON ↔ .env Converter — Convert a JSON config object to a .env file and back. Flattens nested objects to UPPER_SNAKE keys, quotes values safely, and coerces booleans and numbers.
• Duplicate Line Remover — Remove duplicate lines while keeping order, with case-insensitive matching, trimming, blank-line dropping and sorting, plus a report of what was duplicated.
• Quadratic Equation Solver — Solve ax² + bx + c = 0 for real or complex roots, with the discriminant, vertex, axis of symmetry and a parabola sketch.
• Character Frequency Analyzer — Count how often each character appears, with options to ignore case and whitespace, shown as a ranked bar chart with counts and percentages.
• Text Reverse & Flip — Reverse text by characters, words or lines, or flip it upside-down with Unicode look-alikes. Copy the result.
• List Shuffler — Shuffle a list into a random order with an unbiased Fisher–Yates shuffle, or pick N random items. Great for draws, teams and sampling.
• CSS object-fit Preview — Preview how an image behaves in a fixed box across object-fit modes and object-position values. Load your own image and copy the CSS.
• Work Hours Timecard — Add clock-in/out times with break deductions to get hours per day, a weekly total and optional pay at an hourly rate. Handles overnight shifts.
• CSS Text Stroke — Create outlined or hollow text with -webkit-text-stroke plus an optional shadow-based outline fallback. Tune fill, stroke color and width, preview, and copy the CSS.
• .htaccess Generator — Toggle common Apache rules — force HTTPS, drop www, SPA fallback, gzip, caching, security headers, file hardening and custom error pages — and copy a ready .htaccess.
• SVG to CSS Background — Convert raw SVG markup into a CSS background-image (or mask/content) data URI using compact URL-encoding — no base64 bloat, no file to host. Live preview and copy.
• CSS Blend Mode Previewer — Preview every CSS mix-blend-mode by compositing two colored layers, with a gallery of all 16 modes and copyable CSS.
• HTML to JSX Converter — Convert HTML to JSX: class → className, for → htmlFor, inline style strings to style objects, camelCased attributes and self-closed void elements.
• Modular Arithmetic — Compute a mod n, gcd(a, n), the modular multiplicative inverse, and Euler's totient φ(n) — exact, BigInt-backed, for integers of any size.
• Responsive srcset Generator — Generate responsive image markup: an <img srcset> with width descriptors and sizes, or a full <picture> with AVIF/WebP sources and lazy loading.
• CSS Media Query Helper — Build min/max-width media queries from device presets or custom values, plus feature queries for dark mode, reduced motion, hover and high-DPI. Copy the CSS.
• Rock Paper Scissors — Play rock paper scissors against the computer, which chooses with cryptographic randomness. Tracks your wins, losses and ties for the session.
• File Checksum & Verify — Hash a file with SHA-1, SHA-256, SHA-384 or SHA-512 and verify it against an expected checksum. Uses the Web Crypto API — the file never leaves your browser.
• Conic Gradient Generator — Generate CSS conic-gradient() values — color wheels, pie charts and angular sweeps — with adjustable stops, starting angle and center. Live preview and copy.
• Uptime / SLA Calculator — Convert an availability percentage (the 'nines') into allowed downtime per day, week, month, quarter and year. See what 99.9% vs 99.99% really means.
• CSS Box Model Visualizer — Interactively visualize margin, border, padding and content with live totals for content-box vs border-box, and copyable CSS.
• .dockerignore Generator — Toggle common groups — version control, node_modules, build output, secrets, editor junk and Docker files — to shrink build context and keep secrets out of images.
• Random Date Generator — Generate random dates (and optional times) within a range using cryptographic randomness, filter to weekdays or weekends, and choose a format. Great for test data.
• CSS Cursor Gallery — Hover to preview every CSS cursor value (pointer, grab, zoom-in, resize handles and more) and click to copy the declaration.
• CSS Multi-Column Generator — Generate a CSS multi-column layout with column-count or column-width, gap and a column rule, with a live preview and copyable CSS.
• Zalgo / Glitch Text — Turn text into glitchy 'Zalgo' text with combining diacritical marks above, through and below characters. Adjustable intensity and direction.
• Cowsay Generator — Make the classic cowsay ASCII cow (and friends — tux, dragon, sheep) say your message in a word-wrapped speech bubble. Copy the ASCII art.
• Heart Rate Zones — Calculate training heart-rate zones from age and resting HR using the 220−age or Tanaka max-HR formulas and the %HRmax or Karvonen method.
• .htpasswd Generator — Generate Apache/Nginx basic-auth entries with the SHA-1 {SHA} scheme (computed locally via Web Crypto) or plaintext. The password never leaves your browser.
• Savings Goal Calculator — Work out how long to reach a savings goal at a given monthly contribution, or the monthly amount needed to hit a goal by a deadline — with compound interest.
• Luhn Validator — Validate a number with the Luhn (mod-10) algorithm used by credit cards and IMEIs, compute the check digit for a partial number, and detect the card network.
• JSON to Table — Render a JSON array of objects as a table and export it as Markdown, CSV or HTML. Columns are the union of all keys; nested values are stringified.
• Ordinal Number Converter — Convert a number into its ordinal form: the suffix (1st, 2nd, 3rd) and the spelled-out ordinal (first, twenty-third, one hundredth).
• CSS Grid Areas Builder — Paint named regions onto a grid and get grid-template-areas CSS with matching columns and rows. Click-drag to assign areas; presets for common layouts.
• CSS :nth-child Tester — Type an An+B formula (or odd/even) and see exactly which items it selects, highlighted live. Understand nth-child once and for all.
• Gray Code Converter — Convert between an integer, binary and reflected Gray code (and back). Gray code changes one bit between consecutive values — used in encoders.
• ROT13 / ROT-N Cipher — Encode or decode with ROT13 (or any ROT-N rotation), optionally rotating digits by 5 (ROT18). ROT13 is its own inverse.
• Fullwidth / Vaporwave Text — Convert text to fullwidth Unicode for the vaporwave aesthetic, with an optional extra-spaced variant. Copy the result.
• Anagram Checker & Scrambler — Check whether two phrases are anagrams (ignoring case, spaces and punctuation) and generate random letter scrambles of a word.
• Dog & Cat Age Calculator — Convert your dog's or cat's age into human years using better-than-×7 veterinary scales (dog age adjusts by size). A fun estimate, not vet advice.
• Rule of 72 — Estimate how long an investment takes to double using the Rule of 72 versus the exact value, plus the Rule of 114 (triple) and 144 (quadruple).
• Half-Life Decay Calculator — Compute exponential decay from a half-life: amount remaining after a time, decay constant, mean lifetime and a decay curve. Works for any time unit.
• CSS aspect-ratio Generator — Generate the CSS aspect-ratio property with a padding-top hack fallback for older browsers, with a live preview and presets.
• CSS Reset Generator — Generate a modern CSS reset to normalize default browser styles, with toggleable opinionated defaults. Copy and drop into any project.
• CSS Button Generator — Design a button with live controls for color, radius, padding and shadow, then copy the ready-to-use CSS.
• CSS Scroll Snap Generator — Build a scroll-snap container with axis, alignment and stop settings, plus a live preview and copyable CSS.
• SVG Progress Ring — Create a circular progress ring in SVG with adjustable size, stroke, color and value. Copy the markup instantly.
• Initials Avatar Generator — Turn a name into a colorful initials avatar as SVG or data URL, with shape and color options. Great placeholders.
• Superscript & Subscript Text — Convert text to Unicode superscript or subscript characters that work anywhere — usernames, bios, captions.
• Small Caps Text — Transform text into Unicode small caps for a stylish all-caps look that copies into any app.
• Mocking SpongeBob Text — Generate alternating-case mOcKiNg text from any phrase for memes and sarcasm. Click to copy.
• Clap Text Generator — Insert 👏 clap 👏 emoji 👏 between words for emphatic social posts. One click to copy.
• Kaomoji Picker — A categorized gallery of Japanese text emoticons — happy, shrug, love, angry, cute animals and more. Click to copy.
• Strip Markdown — Remove Markdown syntax — headings, bold, links, images, code, lists, quotes — and get clean plain text back.
• Repeat Text — Repeat any string a chosen number of times with a separator and optional numbering. Handy for test data and filler.
• Slope Calculator — Enter two points and get the slope, y-intercept, line equation, distance, midpoint and angle with a quick visualization.
• Circle Calculator — Give the radius, diameter, circumference or area of a circle and instantly compute all the others.
• Number Range Generator — Generate a numeric sequence from start to end with a custom step, separator and optional zero-padding.
• Time Ago — Turn a date, ISO string or Unix timestamp into a live relative time like '3 hours ago' or 'in 2 days'.
• Feels Like Calculator — Compute the 'feels like' temperature from wind chill or heat index using the official NWS formulas, in °C or °F.
• Calories Burned Calculator — Estimate the calories you burn for an activity using standard MET values and your weight and duration.
• CAGR Calculator — Calculate compound annual growth rate between a start and end value over time, with total growth and a yearly projection.
• Checklist — A simple checklist with a progress bar that saves to your browser automatically. No account, no servers.
• CSS Tooltip Generator — Generate a pure-CSS hover tooltip with adjustable position, colors and radius using a data attribute. Live preview and copyable CSS.
• CSS Corner Ribbon — Create a diagonal corner ribbon badge (NEW, SALE) with adjustable corner, colors and text. Live preview and copyable CSS.
• CSS Focus Ring Generator — Design an accessible :focus-visible ring with adjustable color, width, offset, style and radius. Live preview and copyable CSS.
• CSS Section Divider — Generate a styled section divider — solid, dashed, gradient or with centered text. Live preview and copyable CSS.
• Remove Line Breaks — Strip line breaks from text with options to keep paragraph breaks and collapse extra spaces. Great for cleaning pasted content.
• Reverse Word Order — Reverse the order of words, lines or characters in any text, line by line.
• Vowel & Consonant Counter — Count vowels, consonants, letters, digits, spaces and other characters in any text.
• Acronym Generator — Turn a phrase into an acronym from its initials, optionally including small words and dots between letters.
• Random Word Generator — Generate random English words for naming, brainstorming, games and writing prompts.
• Unique Words Extractor — Extract the distinct words from text with frequency counts, case-insensitive option and sorting.
• Upside Down Text — Flip your text upside down using Unicode look-alike characters that copy into any app.
• Substring Counter — Count how many times a word, substring or regex pattern appears in text, with case and overlap options.
• Pythagorean Theorem — Solve a right triangle with a² + b² = c² — find the hypotenuse from two legs or a leg from the hypotenuse.
• Factorial Calculator — Compute n! exactly for any non-negative integer using big integers, with digit count.
• Prime Factorization — Break any integer into its prime factors, shown in expanded and exponent form. Detects primes.
• Average Calculator — Paste numbers and get the mean, median, mode, range, sum, min, max and standard deviation.
• Rounding Calculator — Round a number to decimals or the nearest multiple, with floor, ceil and truncate variants.
• Percent Change Calculator — Calculate the percentage change between two values, with absolute difference and multiplier.
• Simple Interest Calculator — Calculate simple interest and the total amount from principal, annual rate and time.
• Down Payment Calculator — Work out the down payment and remaining loan amount from a purchase price and deposit percentage.
• Overtime Pay Calculator — Calculate overtime pay from your hourly rate, regular hours, overtime hours and multiplier.
• Annuity Calculator — Project the future value of regular monthly contributions plus an initial balance, compounded monthly.
• Macronutrient Calculator — Split your daily calorie target into protein, carbohydrate and fat grams using preset or custom ratios.
• Blood Alcohol Estimator — Get a rough blood alcohol concentration estimate from body weight, drinks and time. Educational only.
• Due Date Calculator — Estimate a pregnancy due date from the last menstrual period, with current week and trimester.
• Pros & Cons List — Weigh a decision with weighted pros and cons and get a running score and verdict. Saves to your browser.
• World Clock — See the current time across multiple time zones at a glance, live-updating. Add or remove zones.
• Meeting Cost Calculator — Estimate what a meeting costs from attendees, hourly rate and duration, with a live ticking cost timer.
• Magic 8 Ball — Ask the Magic 8 Ball a yes/no question and get a classic fortune-telling answer.
• Random Emoji Picker — Generate random emoji by category or all at once and click to copy. Great for posts, names and games.
• Sentence Case Converter — Convert text to sentence case, with quick UPPERCASE, lowercase, Title Case and alternating toggles.
• Remove Empty Lines — Strip blank and whitespace-only lines from text, with options to trim spaces and collapse multiple blanks.
• Numbered List Maker — Add sequential numbers to each line with a custom start, separator and zero-padding.
• Text Indenter — Indent or outdent every line by a chosen number of spaces or tabs.
• Longest Word Finder — Find the longest and shortest words in text, with counts and average word length.
• Random Name Generator — Generate random full names from built-in name lists, with gender and count options.
• Username Generator — Create memorable usernames from adjectives and nouns with optional numbers and separators.
• Word Scrambler — Scramble the letters within each word, optionally keeping the first and last letter fixed.
• Text Padding — Pad each line to a target width on the left, right or center with a fill character.
• Text Truncator — Truncate text or lines to a maximum length with an ellipsis, with a word-boundary option.
• CSS Card Generator — Design a card with padding, radius, shadow, background and border, then copy the CSS.
• CSS Input Styler — Style an input field with border, radius, padding and a focus ring, then copy the CSS.
• CSS Badge Generator — Create badge and pill styles with background, color, radius and size. Live preview and CSS.
• CSS Checkbox Generator — Build a custom checkbox with adjustable size, accent color and radius. Live preview and CSS.
• CSS Toggle Switch — Generate a toggle switch with adjustable size and on/off colors. Live working preview and CSS.
• CSS Spinner Generator — Create a loading spinner with adjustable size, thickness, color and speed. Animated preview and CSS.
• CSS Skeleton Loader — Generate a shimmering skeleton placeholder with adjustable size and color. Animated preview and CSS.
• CSS Glow Effect — Build a glowing box-shadow effect with adjustable color, blur, spread and intensity. Preview and CSS.
• CSS Stripes Background — Generate a striped background with two colors, stripe width and angle. Live preview and CSS.
• CSS Dots Background — Create a polka-dot background with adjustable dot color, size and gap. Live preview and CSS.
• CSS Grid Background — Generate a grid-line background with adjustable line color, cell size and thickness. Preview and CSS.
• CSS Corner Cut — Create chamfered cut-corner shapes with clip-path. Choose corners and cut size. Preview and CSS.
• CSS Speech Bubble — Generate a speech bubble with a tail on any side, adjustable color and radius. Preview and CSS.
• CSS Gradient Border — Build a gradient border with multiple colors, width and radius. Live preview and copyable CSS.
• CSS Frosted Glass — Create a frosted-glass backdrop-blur effect with adjustable blur, opacity and tint. Preview and CSS.
• Exponent Calculator — Raise a base to any exponent, including negative and fractional powers, with scientific notation.
• Nth Root Calculator — Find the nth root of a number, with validation for even roots of negatives.
• 3D Distance Calculator — Compute the distance between two points in 3D space, with per-axis deltas.
• Midpoint Calculator — Find the midpoint between two 2D points, plus the slope and distance.
• Area Calculator — Compute the area of a rectangle, triangle, circle, trapezoid or parallelogram.
• Volume Calculator — Compute the volume of a cube, box, sphere, cylinder, cone or pyramid.
• Perimeter Calculator — Compute the perimeter or circumference of common shapes.
• Triangle Angle Solver — Solve all three interior angles of a triangle from its side lengths using the law of cosines.
• Divisors Lister — List every divisor of an integer with the count, sum, and prime/perfect detection.
• Percentage Calculator — Three calculators: X% of Y, X is what % of Y, and percentage increase/decrease.
• Mixed Number Converter — Convert between improper fractions and mixed numbers, simplified automatically.
• Metric Prefix Converter — Convert a value between SI prefixes from pico to tera.
• Clothing Size Converter — Convert adult clothing sizes between US, UK, EU and international (S–XL).
• Oven Temperature Converter — Convert oven temperatures between Celsius, Fahrenheit and UK gas mark with a description.
• Freelance Hourly Rate — Work out the hourly rate you need from a target income, billable hours and expenses.
• Markup Calculator — From cost and markup percentage, compute selling price, profit and the resulting margin.
• Commission Calculator — Calculate sales commission from an amount and rate, with an optional base salary.
• Car Lease Calculator — Estimate a monthly lease payment from price, down payment, residual value, money factor and term.
• CD Calculator — Project the maturity value and interest of a certificate of deposit from APY, term and compounding.
• Cash Rounding Calculator — Round a total to the nearest cash increment and see the rounding difference.
• Salary Raise Calculator — Find your new salary after a raise percentage, or the raise percentage between two salaries.
• Payment Fee Calculator — Calculate processing fees and net received, with a gross-up mode to hit a target amount.
• Stock Average Calculator — Average your cost per share across multiple buys to find your true break-even price.
• Dividend Calculator — Compute dividend yield and annual and monthly income from share price, dividend and holdings.
• Priority Task List — Add tasks with High/Medium/Low priority, auto-sorted, with checkoff and autosave.
• Grocery List — Build a grocery list grouped by category, check items off and clear them. Saves automatically.
• Goal Tracker — Track goals with current and target values, progress bars and percentages. Saves automatically.
• Daily Planner — Plan your day hour by hour in an editable schedule that saves to your browser.
• Time Block Planner — Add time blocks with start, end and label; see each duration and the total. Saves automatically.
• Quick Note — A scratchpad that auto-saves to your browser, with live word and character counts.
• Conversation Starter — Draw a random icebreaker question to get any conversation going.
• Raffle Draw — Paste names and draw random winners, with an option to remove winners from the pool.
• Tier List Maker — Rank items into S/A/B/C/D tiers with simple controls. Saves automatically.
• Planning Poker — Pick a Fibonacci story-point estimate with reveal/hide for team estimation.
• Waist-to-Hip Ratio — Calculate your waist-to-hip ratio and see the associated health-risk category.
• Protein Target Calculator — Estimate your daily protein target from body weight and activity level.
• Steps to Distance — Convert step count into distance and rough calories using your height or stride.
• Sleep Debt Tracker — Tally a week of sleep against your target to see your sleep debt or surplus.
• Age on Other Planets — See how old you'd be on Mercury, Mars, Jupiter and the rest of the solar system.
• Half Birthday Calculator — Find your half-birthday date and the countdown to the next one.
• Life Percentage — Estimate the percentage of your life lived against a life expectancy, with a progress bar.
• Caffeine Calculator — See how much caffeine remains in your system over time using its ~5-hour half-life.
• Smoking Cost Calculator — Add up the cost of smoking per day, month, year and decade.
• Race Pace Band — Get the pace and per-kilometre splits you need to hit a goal finish time.
• Body Surface Area — Calculate body surface area with the Mosteller formula in metric or imperial units.
• Variable Name Converter — Convert an identifier between camelCase, PascalCase, snake_case, kebab-case and CONSTANT_CASE.
• JSON String Escaper — Escape or unescape a string for safe embedding inside JSON.
• CSS to JS Object — Convert CSS declarations into a camelCased JavaScript/React style object.
• Character Code Converter — Turn text into Unicode code points (decimal and hex) and back again.
• Timestamp Difference — Find the difference between two dates in days, hours, minutes and seconds.
• Deslugify — Turn a URL slug back into readable Title Cased words.
• Case Style Detector — Detect whether an identifier is camelCase, snake_case, kebab-case and more.
• Tabs ↔ Spaces — Convert between tabs and spaces in code with a configurable tab width.
• JSON Key Extractor — Extract every key from JSON, including nested dot-paths.
• CSS Variables Generator — Turn a list of name/value pairs into a :root block of CSS custom properties.
• Strip Code Comments — Remove line, block and hash comments from pasted code.
• Find Duplicate Lines — Find duplicate lines with their counts, with ignore-case and trim options.
• CSV Column Extractor — Pull a single column out of CSV by header name or index.
• List to JSON Array — Convert a list of lines into a JSON array with string, number or auto-detected values.
• JSON to Query String — Convert a flat JSON object into a URL-encoded query string.
• List Sorter — Sort a list alphabetically, numerically, by length or reversed, with dedupe and case options.
• Key-Value Parser — Parse key=value or key: value lines into a JSON object.
• JSON Value Extractor — Extract all leaf values from JSON as a flat list.
• Random Hex Color — Generate a random hex color with a big swatch, RGB values and a quick palette.
• Lottery Number Generator — Generate unique lottery numbers with presets like 6/49 and Powerball.
• Fantasy Name Generator — Generate fantasy-style names from syllable combinations.
• Random Quote — Draw a random inspirational quote to spark some motivation.
• Would You Rather — Get a random would-you-rather dilemma for parties and icebreakers.
• Truth or Dare — Draw a random truth or dare prompt, family-friendly fun.
• Team Name Generator — Generate catchy team names from adjective and noun combinations.
• Pet Name Generator — Find a name for your dog or cat by type and vibe.
• Band Name Generator — Generate band names from creative word patterns.
• Draw a Card — Draw playing cards from a shuffled 52-card deck.
• Random Fact — Learn a random fun fact at the click of a button.
• Random Direction Spinner — Spin for a random compass direction, yes/no/maybe, or left/right.
• Docker Run → Compose — Convert a docker run command into an equivalent docker-compose.yml service.
• IBAN Validator & Generator — Validate an IBAN with the mod-97 algorithm, format it, identify the country, and generate test IBANs.
• Device Info — Live read-out of your browser, screen, GPU, CPU cores, timezone and connection — all local.
• Kubernetes Secret / ConfigMap — Turn KEY=VALUE pairs into a Kubernetes Secret (base64) or ConfigMap manifest.
• GitHub Actions Workflow Builder — Generate a CI workflow YAML from triggers, runner, language setup and your build steps.
• SVG → PNG — Rasterize SVG markup to a downloadable PNG at any scale, transparent or solid background.
• systemd Service Unit — Build a .service unit file from fields: ExecStart, user, environment, restart policy and more.
• Caddyfile Generator — Generate a Caddy v2 config for reverse proxy, static sites, PHP or redirects with automatic HTTPS.
• SQL JOIN Visualizer — See INNER, LEFT, RIGHT, FULL and CROSS joins as a Venn diagram, SQL, and a live result.
• Appointment Booking — Pick a day, book free time slots within your working hours, and save it all in your browser.
• Tally Counter — Named, multi-counter tally with + / − buttons and 1–9 keyboard shortcuts. Saved locally.
• NPS Calculator — Paste survey ratings (0–10) and get the Net Promoter Score with distribution and verdict.
• Packing List — Categorised trip checklist with presets, progress bars, and Markdown export. Saved locally.
• rsync Command Builder — Compose an rsync command from options: archive, compress, delete, dry-run, excludes and SSH push/pull.
• find Command Builder — Build a GNU find command: path, name, type, depth, size, mtime, and an action like -delete or -exec.
• GitLab CI Generator — Generate a .gitlab-ci.yml from a default image, stages, cache and jobs with scripts.
• Public Holidays — Official public holidays for any country and year, with a countdown to the next one.
• GitHub User Explorer — Look up a GitHub user's public profile and their most-starred repositories.
• IP Geolocation — Locate your own IP or any IP/domain — city, ISP, organisation and timezone.
• Random User Generator — Generate realistic fake people (name, email, phone, address, photo) for test data. Copy as JSON.
• Sunrise & Sunset — Sunrise, sunset, solar noon, day length and twilight for any location and date.
• GitHub Repo Explorer — A repository's stars, forks, issues, license, topics and language breakdown.
• GitHub Repo Search — Search repositories by keyword and qualifiers; sort by stars, forks or recency.
• GitHub Gists Viewer — Browse any user's public gists with their files, languages and update times.
• GitHub Org Explorer — An organisation's profile and its most-starred public repositories.
• GitHub Releases — A repo's releases with notes, pre-release flags and per-asset download counts.
• Wikipedia Lookup — Search Wikipedia and read article summaries with thumbnails.
• Pokédex — Look up any Pokémon's artwork, types, base stats and abilities.
• Spaceflight News — Latest spaceflight news, blogs and mission reports. Search by keyword.
• Word Tools — Find rhymes, synonyms and related words for writing and naming.
• Trivia Quiz — Play a multiple-choice quiz by category and difficulty, and see your score.
• TV Show Finder — Search TV shows for ratings, genres, network and summaries.
• iTunes Search — Search Apple's catalogue of songs, podcasts, movies, apps and books.
• Place Geocoder — Turn a place name into coordinates, country, timezone, elevation and population.
• Name Guesser — Predict likely age, gender and nationality from a first name (just for fun).
• Animal Pics — Random dog and cat photos on demand, with dog breed filtering.
• Currency Converter — Convert between world currencies at live ECB reference rates.
• npm Package Info — An npm package's version, license, dependencies and weekly downloads.
• Cocktail Finder — Search cocktails and mocktails for ingredients, measures and instructions.
• Brewery Finder — Find breweries by name or city with type, address, phone and website.
• Quote Generator — Fresh random quotes on demand, with one-tap copy.
• Random Advice — A random slip of advice whenever you need a little wisdom.
• Cat Facts — Purr-fectly random feline trivia, one fact at a time.
• Programming Jokes — Clean developer humour with safe-mode always on.
• Card Dealer — Shuffle a 52-card deck and draw playing cards on demand.
• Elevation Lookup — Terrain height above sea level for any coordinates or your location.
• Postal / ZIP Code Lookup — Resolve a ZIP or postal code to its town, region and coordinates across 18 countries. Via Zippopotam.us.
• Anime Search — Search anime by title or browse the current top list — posters, scores, episodes and synopses. Via Jikan / MyAnimeList.
• Poetry Finder — Search classic public-domain poems by title or author, or pull a random one to read and copy. Via PoetryDB.
• SpaceX Launches — Recent SpaceX missions with patches, dates, success/fail outcome and links to the webcast and articles. Via the SpaceX-API.
• Dad Jokes — A fresh random groan-worthy dad joke on demand, with one-tap copy. Via icanhazdadjoke.
• Studio Ghibli Films — The complete Studio Ghibli filmography with posters, directors, runtimes and scores. Via the Studio Ghibli API.
• Rick & Morty Characters — Search the Rick and Morty multiverse cast by name — portraits, status, species and location. Via the Rick and Morty API.
• Manga Search — Search manga by title or browse the top list with covers, scores, chapter and volume counts. Via Jikan / MyAnimeList.
• Rhyme Finder — Find perfect rhymes, near-rhymes, similar-sounding and related words for songwriting and poetry. Via the Datamuse API.
• MusicBrainz Search — Search the open music encyclopedia for artists with type, country, active years and genre tags. Via MusicBrainz.
• Trending Coins — The most-searched cryptocurrencies on CoinGecko in the last 24 hours, with price and 24h change. Via CoinGecko.
• Dog Breed Gallery — Pick from 100+ dog breeds and sub-breeds and browse sample photos. Via the Dog CEO API.
• Astronomy Picture of the Day — NASA's daily space image with full explanation and a date picker to browse the archive. Via the NASA APOD API.
• Redirect & DNS Chain Checker — Trace a domain's CNAME chain to its final A/AAAA records and follow every HTTP redirect hop with status codes — ideal for debugging CDN and redirect setups.
• MTG Card Search — Search Magic: The Gathering cards by name or Scryfall query, with full card images, set, rarity and price. Via Scryfall.
• World Bank Data — Chart population, GDP, life expectancy, inflation and more for any country over the decades. Via the World Bank Open Data API.
• Actor & People Search — Search actors and TV/film people by name with photos, country, birth year and age. Via the TVmaze API.
• PC Game Deals — Current PC game discounts across Steam, GOG, Fanatical and more, with sale price, savings and Steam rating. Via CheapShark.
• TV Schedule — See what's airing on TV for a chosen country and date, with network, time, episode and genres. Via the TVmaze API.
• Marine & Surf Forecast — Current wave height, period, direction and swell for any coastal location. Via the Open-Meteo Marine API.
• Nobel Prize Explorer — Browse Nobel laureates by year and category with their citations. Via the official Nobel Prize API.
• Star Wars Explorer — Search the Star Wars universe — characters, planets, starships and films with stats. Via SWAPI.
• Species Search — Look up the scientific classification of any animal or plant by species or common name. Via the GBIF taxonomy.
• Near-Earth Asteroids — Asteroids making close approaches to Earth on a chosen day, with size, speed and miss distance. Via NASA NeoWs.
• Anime This Season — Currently-airing anime this season with posters, scores and popularity. Via Jikan / MyAnimeList.
• Digimon Search — Search Digimon by name and see their level, type, attribute and artwork. Via the community Digi-API.
• Crypto Global Market — Whole-market crypto stats: total market cap, 24h volume and change, and coin dominance. Via CoinGecko.
• Disney Character Search — Search Disney characters by name with images and the films, shows and games they appear in. Via the Disney API.
• Song Lyrics Finder — Find the lyrics to any song by artist and title, with one-tap copy. Via the lyrics.ovh API.
• Random Recipe — Get a random meal with ingredients and step-by-step instructions when you're stuck for dinner. Via TheMealDB.
• Upcoming Rocket Launches — The next orbital launches worldwide with provider, pad, status and a live countdown. Via The Space Devs Launch Library.
• Project Gutenberg Search — Search 70,000+ free public-domain ebooks by title or author, with read/download links. Via Gutendex.
• Address & Place Search — Geocode any address, place or landmark to coordinates with a map link and copy. Via OpenStreetMap Nominatim.
• Chuck Norris Jokes — A fresh random Chuck Norris joke on demand, with one-tap copy. Via chucknorris.io.
• Useless Facts — A random (useless) fact whenever you want one, with copy. Via the Useless Facts API.
• Daily Affirmations — A small positive affirmation on demand, with one-tap copy. Via affirmations.dev.
• Dog Facts — Random canine trivia on tap, with copy. Via the kinduff Dog Facts API.
• Random Joke — A two-line joke — read the setup, then reveal the punchline. Via the Official Joke API.
• Stock Photo Browser — Browse free Lorem Picsum stock photos with author credit and direct download links.
• Wikidata Entity Search — Search Wikidata for people, places and concepts, with Q-ids, labels and descriptions.
• ISBN Lookup — Identify any book from its ISBN-10/13 — title, authors, cover, publisher and pages. Via Open Library.
• Word Autocomplete — Live completion and spelling suggestions as you type a partial word. Via the Datamuse API.
• Earth from Space — Full-disc images of Earth from NASA's EPIC camera on DSCOVR, with a time slider. Via NASA EPIC.
• Live Wikipedia Edits — Watch Wikipedia edits stream in live via Wikimedia EventStreams — filter by project, hide bots, pause anytime. Real-time SSE, no key.
• Crypto Price Chart — Interactive price history for major coins with 24h–1y ranges and a hover crosshair. Via CoinGecko.
• Planes Overhead — See aircraft flying near any location right now — callsign, country, altitude, speed and heading. Via the OpenSky Network.
• Live Crypto Ticker — Real-time crypto prices streamed over Coinbase's public WebSocket — each tick flashes green/red with live 24h change. No key.
• Earthquake Map — Recent earthquakes worldwide on an interactive map, sized and coloured by magnitude. Live USGS data.
• Live Natural Events Map — Active wildfires, storms, volcanoes and icebergs worldwide on an interactive map. Live NASA EONET data.
• Live Rain Radar — Animated worldwide precipitation radar for the last two hours, layered on an interactive map and centred on you. Via RainViewer.
• The Sun Right Now — Near-real-time images of the Sun across ten wavelengths from NASA's Solar Dynamics Observatory, auto-refreshing every minute.
• Bitcoin Network Monitor — Live Bitcoin fees (sat/vB), mempool backlog, latest blocks and the next difficulty adjustment. Via mempool.space.
• Live Trade Tape — A scrolling tape of real executed crypto trades streamed over Coinbase's WebSocket — price, size, aggressor side and time.
• Text to Handwriting — Turn typed text into a natural handwriting-style note on ruled paper, with adjustable ink, font and messiness, then download as PNG. Runs entirely in your browser.
• QR Batch Generator — Generate a whole batch of QR codes from a list — one per line — with adjustable size, margin and error correction, then download each or all. Browser-only.
• Markdown Cheat Sheet — A searchable Markdown reference with side-by-side rendered previews and click-to-copy syntax, covering headings, lists, links, code, tables and GitHub extensions.
• Scientific Calculator — A full scientific calculator with trig (degrees/radians), logs, powers, roots, factorial, constants, memory and history. Safe expression engine, no eval.
• Guitar Chord Library — Common guitar chords as clean fretboard diagrams — major, minor, 7th, maj7 and m7 voicings. Search by name. Runs in your browser.
• Snippet Manager — Save, search and copy your code snippets with titles, language and tags — stored privately in your browser, with JSON export/import. No account.
• Chart Maker — Paste label,value rows and get a clean bar, line, pie or donut chart as inline SVG you can download. Browser-only, no upload.
• Virtual Piano — A playable two-octave piano using the Web Audio API — play with mouse or keyboard, pick a waveform and octave. No samples, no network.
• ASCII Table Maker — Turn CSV or tab-separated rows into a tidy monospace table with ASCII or Unicode box-drawing characters, or Markdown. For READMEs and comments.
• ASCII Camera — Turn your webcam into real-time ASCII art with mirror, invert, colour and density controls. The video stays on your device — nothing is uploaded.
• Matrix Rain — The iconic falling-code effect with adjustable speed, glyphs, size and colour, plus fullscreen. Pure canvas, runs locally.
• Doom Fire — The legendary PSX-Doom flame algorithm running live, with cooling and palette controls. Click to relight. Pure canvas, no dependencies.
• 2048 — The classic slide-and-merge puzzle — arrow keys, WASD or swipe to reach 2048. Score and best saved locally. No ads, no tracking.
• Minesweeper — The classic mine-finding puzzle with three difficulties, first-click-safe placement, flagging and a timer. Runs entirely in your browser.
• Reaction Time Test — Click the moment the panel turns green and measure your reaction in milliseconds, with best and average across attempts.
• Aurora Forecast Map — Where the northern & southern lights may be visible right now — NOAA's OVATION auroral-oval model draped over an interactive world map.
• GitHub Live Activity — A near-real-time feed of public activity across GitHub — pushes, stars, forks, PRs, issues and releases. Via the GitHub Events API.
• Live Satellite Imagery — Near-real-time geostationary weather-satellite views (GOES-East & West) — full disk, US, AirMass and infrared, auto-refreshing. Via NOAA.
• NASA Image Library — Search NASA's vast public image library — galaxies, missions, planets and more — with full-resolution links. Via images.nasa.gov.
• Wikipedia Featured Today — Wikipedia's featured article, picture of the day and most-read pages for any date. Via the Wikipedia REST API.
• iNaturalist Observations — A live gallery of recent research-grade wildlife and plant sightings with photos, searchable by species. Via iNaturalist.
• Wayback Machine Lookup — Find the closest archived snapshot of any URL in the Internet Archive, optionally near a date. Via the Wayback availability API.
• DEV Top Articles — The top trending developer articles from dev.to, filterable by tag and time range, with reactions and reading time. Via the DEV API.
• PyPI Package Lookup — Look up any Python package on PyPI — version, summary, author, license, Python support, links and recent releases. Via the PyPI API.
• crates.io Lookup — Look up any Rust crate — version, downloads, description, keywords and links. Via the crates.io API.
• Art Institute of Chicago — Search the Art Institute of Chicago's open collection with high-resolution images. Via the AIC public API.
• Species Sightings Map — Search any species and map its recorded sightings worldwide on an interactive map. Via the GBIF biodiversity database.
• Internet Archive Search — Search millions of free books, films, audio, software and images in the Internet Archive. Via archive.org.
• Formula 1 Standings — Current Formula 1 driver and constructor standings plus the full race calendar. Via the Jolpica/Ergast F1 API.
• Sports Team Explorer — Search sports teams across football, basketball, F1, cricket and more, with badges, stadium and history. Via TheSportsDB.
• Domain RDAP Lookup — Look up domain registration data via RDAP, the structured successor to WHOIS: registrar, status, dates and nameservers.
• US Weather Alerts — Live watches, warnings and advisories from the US National Weather Service, by state. Via api.weather.gov.
• Nearby Places — Search any place or use your location and map nearby cafés, ATMs, pharmacies and fuel. Via OpenStreetMap Overpass.
• Fruit Nutrition Explorer — Compare per-100g calories, sugar, carbs, protein and fat for common fruits, plus botanical family. Via Fruityvice.
• FBI Most Wanted — Browse the FBI's public Most Wanted fugitive and missing-person listings with photos and reward info. Via the FBI API.
• Lichess Player Lookup — Look up any Lichess chess player's ratings across bullet, blitz, rapid and classical, plus win/loss record.
• D&D 5e SRD Explorer — Search Dungeons & Dragons 5e monsters and spells from the open System Reference Document. Via Open5e.
• UK Grid Carbon Intensity — Live carbon intensity and generation mix of Great Britain's electricity grid in gCO₂/kWh. Via the Carbon Intensity API.
• Flow Field — Watch thousands of particles trace silky trails through a flowing noise field, then export the generative art as PNG.
• Live Spectrogram — A scrolling real-time spectrogram of your microphone — see frequencies over time as a colorful heatmap. Audio stays local.
• Metaballs — A mesmerising lava-lamp of gooey blobs that stretch and merge using an implicit-surface field. Tune count and palette.
• Cloth Simulation — A real-time hanging cloth built from Verlet physics — drag to push the fabric, tear it, and add wind.
• Terrain Generator — Generate procedural islands and mountains with the diamond-square algorithm: oceans, forests, snow. Export to PNG.
• Mandala Maker — Draw with kaleidoscopic symmetry — every stroke is mirrored across rotational sectors into a perfect mandala. Export to PNG.
• Phyllotaxis — Generate the golden-angle spiral nature uses to pack sunflower seeds; animate the divergence angle. Export to PNG.
• Starfield Warp — A 3D starfield warp tunnel with perspective projection and motion-blur streaks at warp speed.
• Lissajous Curves — Explore the elegant figures traced by two perpendicular sine waves; tune the frequency ratio and animate the phase.
• Fireworks — An interactive fireworks playground — click anywhere to launch a rocket that bursts into glowing, gravity-pulled sparks.
• OpenAlex Scholar — Search hundreds of millions of research papers, books and datasets by topic, title or author, with citation counts. Via OpenAlex.
• Wikipedia Pageviews — Chart daily Wikipedia traffic for any article over 60 days, with totals, averages and the peak day. Via the Wikimedia API.
• Bitcoin Fees & Mempool — Live Bitcoin transaction fee recommendations, mempool backlog and the latest mined blocks. Via mempool.space.
• Yu-Gi-Oh! Card Search — Search thousands of Yu-Gi-Oh! cards with full artwork, ATK/DEF, level, type and card text. Via the YGOPRODeck database.
• Historical Weather — Look up daily high/low temperatures and precipitation for any place over any past date range, charted. Via Open-Meteo.
• Currency History — Chart how any exchange rate has moved over the last month to five years, with high, low and percent change. Via Frankfurter.
• University Finder — Search thousands of universities worldwide by name and country, with official websites. Via the Hipolabs universities API.
• Ice & Fire Explorer — Search characters and noble houses from A Song of Ice and Fire (Game of Thrones): titles, words, seats and cast.
• The Met Collection — Search the Metropolitan Museum of Art's open-access collection and view artworks with images, artist and date.
• Scryfall MTG Search — Search Magic: The Gathering cards with high-res art, oracle text, set info and prices, using Scryfall's powerful syntax.
• Natural Events Tracker — A live world map of wildfires, severe storms, volcanoes and icebergs from NASA's EONET tracker.
• Wikipedia Nearby — Discover Wikipedia articles geotagged near any place or your location, plotted on an interactive map.
• Stack Overflow Search — Search millions of programming questions by keyword, sorted by relevance or votes, with scores and tags.
• MAC Vendor Lookup — Identify the hardware manufacturer behind any MAC address from its OUI prefix. Via macvendors.com.
• Music Artist Explorer — Search musicians and bands for biographies, genre, formation year and artwork. Via TheAudioDB.
• Crossref Search — Search 150M+ scholarly works by title, author or DOI, with journal, type and citation counts. Via Crossref.
• Tide Predictions — High and low tide times and heights for popular US coastal stations over the next few days. Via NOAA CO-OPS.
• Name Insights — Enter a first name and see its statistically likely age, gender and top nationalities. Just for fun.
• UV Index Forecast — See the daily peak UV index for any place over the coming week, with sun-safety advice. Via Open-Meteo.
• Hacker News User — Look up any Hacker News user's karma, account age, bio and recent submissions. Via the official HN API.
• Binary Clock — A live binary-coded-decimal clock showing hours, minutes and seconds as columns of lit dots. Runs in your browser.
• Hex Color Clock — A clock that reads the current time as a hex color: hours, minutes and seconds become the RGB channels of #HHMMSS.
• Name Masher — Blend two names into portmanteaus — couple names, duo brands or team names. Click any result to copy.
• Name Numerology — Pythagorean destiny, soul-urge and personality numbers from a name, with the reduction steps. Just for fun.
• Chord Progression Player — Build a diatonic chord progression in any major key and play it with the Web Audio API. Pop, jazz and blues presets.
• Color Shades & Tints — Generate tints, shades and tones from a single base color. Click any swatch to copy the hex.
• Markdown Table Sorter — Paste a Markdown table and sort its rows by any column, ascending or descending, numeric or text. Alignment preserved.
• Lorem List Generator — Generate placeholder bulleted, numbered or Markdown task lists with configurable item and word counts.
• Time Until — A live countdown to any date and time — days, hours, minutes and seconds — saved locally in your browser.
• Random Team Generator — Split a list of names into random teams, by number of teams or members per team. Runs entirely in your browser.
• Caesar Brute-Forcer — See all 26 Caesar-shift decryptions of a message at once, with the most English-looking candidate highlighted.
• JSON Size Analyzer — Measure raw, minified and pretty JSON byte sizes, how much minifying saves, and a breakdown of keys and value types.
• Loan Payoff Date — Find when a loan will be paid off from its balance, rate and payment, including extra payments and total interest.
• Note ↔ Frequency — Convert between musical notes and frequencies in Hz using equal temperament, with an adjustable A4 and a playable tone.
• Fractional Base Converter — Convert fractional numbers like 0.1 between binary, octal, decimal, hex and any base 2–36 to a chosen precision.
• Aspect Fit Calculator — Scale a source size to fit inside (contain) or fill (cover) a target box while keeping aspect ratio, with a visual preview.
• Roman Numeral Date — Convert any date into Roman numerals in day/month/year orderings — for tattoos, monuments and credits.
• Leap Year Checker — Check whether any year is a leap year, see the exact rule that applies, and list the next upcoming leap years.
• Moon Phase — Find the Moon's phase, age in days and illuminated percentage for any date using the synodic month.
• Chinese Zodiac — Find the Chinese zodiac animal, five-element and yin/yang for any year, with a lunar-new-year note.
• Dice Probability — Exact probability distribution for the sum of N dice with any number of sides, plus at-least/at-most/exact odds.
• Line Prefix & Suffix — Bulk-add a prefix and suffix to every line — markdown bullets, blockquotes, comment markers, quotes or trailing commas.
• Shuffle Lines — Randomly reorder the lines of a text block using Fisher-Yates, with an optional seed for reproducible shuffles.
• Line Joiner & Splitter — Switch between one-per-line lists and a delimited string, with trim, dedupe, quoting and wrap options.
• Bracket Balance Checker — Find unmatched (), [] and {} in code or text, with rainbow depth colours and the exact line and column of the first mismatch.
• Text Chunker — Split long text into bounded chunks by characters, words, lines or delimiter, with optional overlap. Presets for tweets, SMS and LLM windows.
• Date Range Generator — List every date between two anchors at any step, with weekday filtering and multiple output formats (ISO, US, EU, long).
• HTML Minifier — Shrink HTML by collapsing whitespace, removing comments and tightening attributes. Preserves pre, script, style and textarea content.
• JSON Repair — Turn almost-JSON into valid JSON — strip comments and trailing commas, convert single quotes, quote bare keys and normalise JS/Python literals.
• Batch Timestamp Converter — Paste many timestamps at once and get each converted to epoch seconds/millis, ISO 8601 UTC and local, RFC 1123 and a relative time.
• Position Description Generator — Build a well-structured job description in Markdown from role, team, responsibilities and skills, with presets for common roles and one-tap copy or download.
• Interview Question Bank — Curated interview questions across software roles — filter by role, level and category, shuffle for random draws, and copy the whole set.
• Text Search with Context — Grep-style search over pasted text or logs — every match with N lines of context before and after, case, whole-word and invert options.
• CSV Cleaner — Auto-detect the delimiter, trim cells, drop empty and duplicate rows, align columns to the header and requote to RFC 4180.
• Front Matter Editor — Split Markdown into front matter and body, edit metadata as fields, and convert between YAML, TOML and JSON front matter.
• Email List Validator — Validate and clean a list of addresses — syntax checks, duplicates, role accounts, disposable domains, typo hints and a domain breakdown.
• Regex Replace — Sed-style find and replace with $1 and named capture-group references, live result preview and a table of what each group captured.
• Hash & Checksum Comparator — Hash a local file with SHA-1/256/384/512 and compare it against a published checksum. Handles shasum and BSD formats. The file never leaves your browser.
• ISO 8601 Duration — Parse PnYnMnDTnHnMnS durations into components, totals and a human phrase, or build one from fields. Applies to a date with calendar-correct maths.
• ABN & ACN Validator — Checksum-validate Australian Business and Company Numbers, see the working, format correctly, and derive the ABN for an ACN. Batch mode included.
• Drum Machine — A 16-step sequencer with eight synthesised drum voices, swing, accents and tempo. Every sound is generated live — no samples to load.
• Image Palette Extractor — Drop in a photo and pull out its dominant colours with k-means clustering, with hex/RGB/HSL, dominance shares and CSS or JSON export.
• Projectile Motion — Animated trajectory simulator comparing the vacuum parabola against real air drag, with live sliders for speed, angle, gravity, mass and Cd.
• Tap Tempo — Tap along on screen or with the spacebar and read the BPM, tempo marking, stability, and quarter/eighth/sixteenth delay times.
• AWG Wire Gauge — Convert American Wire Gauge to diameter, cross-section, resistance and ampacity, and estimate voltage drop over a real run in copper or aluminium.
• Bearing & Distance — Great-circle distance in km/mi/nmi, initial and final bearing with a compass rose, and the midpoint between two latitude and longitude points.
• CSS Container Query Playground — Drag to resize a container and watch @container queries respond live. Configure size stops for columns, font, gap, padding and radius, then copy the CSS.
• JWK & JWKS Inspector — Paste a JSON Web Key or Key Set and see key type, algorithm, curve, size, RFC 7638 thumbprint, and export the public key as PEM SPKI. Runs entirely in your browser.
• Bulk File Renamer — Rename many filenames at once with find/replace, regex, prefixes, sequential numbering, case conversion and extension change, with a live before/after preview.
• Access Log Parser — Parse nginx or apache access-log lines in Common or Combined format and see top paths, IPs, status codes, error rate and bytes served — all locally in your browser.
• Delta-E Color Distance — Measure the perceptual difference between two colors with ΔE76, ΔE94 and CIEDE2000, with Lab coordinates, per-channel deltas and a plain-language verdict.
• Retry Backoff Visualiser — Design a retry policy visually. Compare fixed, linear, exponential, equal/full-jitter and decorrelated backoff on a timeline, and copy pseudocode in JS, Python or Go.
• AWS ARN Parser — Break down one or many Amazon Resource Names into partition, service, region, account, resource type and id, with warnings on unusual regions or unknown partitions.
• CIDR Aggregator — Merge overlapping and adjacent IPv4 CIDR blocks into the smallest set of CIDRs that still covers everything. Reports coverage, reduction and per-input mapping.
• CSS :has() Playground — Type a selector against a small HTML tree and see which elements match, live — :has(), :not(), attribute selectors, combinators, anything querySelectorAll supports.
• ANSI Log Colorizer — Paste terminal output containing ANSI escape sequences and see it rendered with the original colors, or strip escapes to plain text. Supports 8, 16, 256 and truecolor.
• CSS Scroll Animation Playground — Design scroll-driven animations with animation-timeline: view() or scroll(). Configure range and effect, watch a live scrollable preview, and copy the CSS.
• Mojibake Fixer — Recover garbled text like café or “smart quotesâ€. Tries Latin-1 and Windows-1252 UTF-8 round-trips, scores the results, and highlights the suspicious sequences.
• Chess FEN Viewer — Paste a Forsyth–Edwards Notation string and see the board rendered in SVG, with side to move, castling rights, en passant, halfmove clock and material count.
• Kubernetes Manifest Inspector — Paste one or many Kubernetes manifests and get a structured view: kind, name, namespace, containers with images and resources, probes, ports, and warnings about common issues.
• CSS Cascade Layers Playground — Learn how @layer reorders the cascade. Edit rules in three named layers, change their order, and watch the preview snap to whichever layer wins. Copy the CSS.
• Database Connection String Parser — Break postgres://, mysql://, mongodb(+srv)://, redis:// and mssql:// URIs into scheme, credentials, hosts, database and options. Exports dotenv and JSON.
• Excel Column Letter Converter — Convert spreadsheet column letters to numbers and back — A ⇄ 1, AA ⇄ 27, XFD ⇄ 16384. Handles A1 cell references and bulk lists with a TSV copy.
• LQIP Placeholder Generator — Drop an image and get a tiny data-URL placeholder for progressive loading. Configure size, format and quality, and copy ready-to-use CSS and HTML snippets.
• Kubernetes Quantity Converter — Parse and convert Kubernetes CPU and memory quantities, compare requests with limits, and generate a resources manifest snippet.
• HTTP Content Negotiation — Test weighted Accept, Accept-Language and Accept-Encoding headers against available server representations.
• SQL Placeholder Converter — Convert SQL bind parameters between question-mark, numbered, colon-named and at-named placeholder styles safely.
• XPath Tester — Evaluate namespace-aware XPath 1.0 expressions against XML or HTML and inspect typed node or scalar results.
• Kubernetes Label Selector Tester — Parse Kubernetes label selectors, test them against object labels and explain every matching requirement.
• Package Manager Command Translator — Generate comparable npm, Yarn, pnpm and Bun commands with workspace, dependency and semantic caveats.
• Docker / OCI Image Reference Inspector — Parse, validate, normalize and compare container image references, including registries, tags and immutable digests.
• URI Template Expander — Expand and explain RFC 6570 Level 4 URI templates with scalar, list and record variables.
• JSON Canonicalizer — Create RFC 8785 JCS output, detect I-JSON hazards and calculate a local SHA-256 digest.
• HTTP Structured Fields Inspector — Parse, validate and serialize RFC 9651 structured field items, lists and dictionaries.
• Language Tag Inspector — Inspect BCP 47 language tags and test RFC 4647 basic filtering and lookup.
• Link Header Inspector — Parse, validate and normalize RFC 8288 Link headers with relations and target attributes.
• Forwarded Header Inspector — Parse and validate RFC 7239 Forwarded headers, proxy hops, node identifiers, host and proto parameters.
• Content-Disposition Inspector — Inspect RFC 6266 dispositions, decode RFC 8187 filename* values, and flag unsafe filename handling.
• HTTP Byte Range Inspector — Resolve RFC 9110 byte ranges against a resource length and validate Range and Content-Range fields.