Free browser-based utilities that streamline coding tasks with instant text processing, data conversion, and validation capabilities.
Java Properties File Formatter This tool formats Java .properties files using the same rules the JDK uses to load them. It accepts =, :, or whitespace as a separator, recognises both # and ! comment styles, and joins backslash continuation lines into clean single-line key/value pairs. Use it on application.properties, logback.properties, ResourceBundle messages_*.properties, or any ...
Try the Tool »CAGR Calculator The CAGR Calculator finds the compound annual growth rate of an investment, business metric, or any value that grows over time. Enter a starting value, an ending value, and the number of years, and the tool computes the smooth annual rate that would carry the start to the end if it grew at ...
Try the Tool »HAR File Formatter & Request Inspector Drop in an HTTP Archive (.har) file exported from your browser’s DevTools and instantly see every request as a sortable, filterable waterfall — with full DNS, connect, SSL, wait, and download timings, plus the raw headers, body, and a ready-to-paste cURL command for any single request. Everything runs locally ...
Try the Tool »NDJSON Formatter & Validator Paste a Newline-Delimited JSON (NDJSON / JSON Lines) document and check every record at once. Each line is parsed independently, so a single broken record does not hide the rest. The tool reports valid and invalid line counts, the most common top-level keys, and the exact parse error for any line ...
Try the Tool »Base64 Image Preview & Decoder Paste a base64-encoded image string and instantly preview the rendered image, with the format auto-detected from the file’s magic bytes. The decoded image, its pixel dimensions, and the decoded byte size are all computed in your browser – no server upload, no waiting on an API. The optional data: URI ...
Try the Tool »WebRTC IP Leak Detector WebRTC is a built-in browser API that powers voice and video calls without plugins. To connect two peers directly, it uses the ICE framework to gather candidate IP addresses — and that list includes the machine’s local LAN IP plus any public address a STUN server can see. When users run ...
Try the Tool »Tailwind CSS Color Scale Generator Paste a single hex color and instantly get a full Tailwind-style 50 to 950 palette with perceptually even steps. The scale is built in OKLCH color space, so every stop feels like an even lightness jump to the human eye — not just a linear drop in RGB or HSL. ...
Try the Tool »Package.json Formatter & Key Sorter Paste any package.json to get a clean, canonical-ordered version back instantly. This tool reorders top-level keys to the standard npm sequence (name, version, description, scripts, dependencies, and so on), validates required and recommended fields, checks your dependency version ranges, and flags non-standard keys that clutter the manifest. Everything happens in ...
Try the Tool »Pixel Art Canvas & CSS Export Paint crisp 8-bit style sprites directly in your browser and export them as pure-CSS box-shadow art, scalable SVG, raster PNG, or portable JSON. The canvas scales from 8×8 up to 64×64, ships with classic palettes (NES, Game Boy, PICO-8, CGA, Commodore 64, Sweetie 16), and gives you paint, eraser, ...
Try the Tool »Sprint Velocity & Capacity Calculator Plan your next sprint with math, not guesswork. Feed in your velocity history, team size, PTO, and focus factor, and get an evidence-based commitment range in story points and hours. How to Use Enter your team size and sprint length in working days. Set productive hours per person per day ...
Try the Tool »Solar Panel Output Calculator Estimate the real-world energy output of a solar panel array in daily, monthly, and annual kWh, along with projected savings, CO₂ offset, and a battery size recommendation. Unlike vague AI-generated estimates, this tool accounts for system losses and panel degradation over a 25-year lifetime so you get a realistic picture instead ...
Try the Tool ».env vs .env.example Key Diff Tool Drift between your actual .env file and the .env.example template is one of the quietest sources of broken deploys. Keys get added in development, copied into production, and then forgotten in the template. Placeholder values stick around in .env where real secrets were supposed to land. This tool lines ...
Try the Tool »SVG to React JSX Component Converter Paste raw SVG markup and get a clean React functional component back. The tool applies deterministic camelCase conversion for every attribute, drops non-JSX syntax, and wraps the output in a ready-to-import component — optionally typed, optionally forwardRef-wrapped, and optionally resized via props. Everything runs locally in your browser, so ...
Try the Tool »CSV to XML Converter Turn any CSV file into clean, well-formed XML without leaving the browser. Paste or upload your data, pick how rows and headers should map, and get back properly escaped XML with the entity edge cases (ampersands, angle brackets, quotes, embedded newlines) handled automatically. Everything runs client-side, so your CSV never leaves ...
Try the Tool »Git Unified Diff & Patch Generator Paste an original snippet and a modified snippet to instantly generate a valid unified diff in .patch format. The output uses correct hunk headers (@@ -L,N +L,N @@) so the patch applies cleanly with git apply or the standard patch utility — no hand-fixing required. How to Use Paste ...
Try the Tool ».editorconfig Generator Build a valid, spec-compliant .editorconfig file for your project without memorising property names or cross-checking values. Pick a preset for your language, tweak the global defaults, toggle a few per-language overrides, and copy the result straight into the root of your repository. EditorConfig files keep indent styles, line endings, character sets, and trailing-whitespace ...
Try the Tool »Stair Rise & Run Calculator Design a code-compliant staircase from a total floor-to-floor rise and an optional total run. The calculator picks the optimal step count, computes each riser height and tread depth, and flags whether the result passes IRC residential or IBC commercial limits. It also draws a side-view SVG diagram and reports the ...
Try the Tool »LLM API Cost Calculator Estimate what an LLM API call will actually cost before you deploy it. Enter the input tokens, output tokens, and your daily call volume, pick a model, and this tool shows you the per-call, per-day, per-month, and per-year spend across OpenAI, Anthropic, Google, and Meta models — using the current published ...
Try the Tool »Morse Code Audio Player Type any text and listen to it played as real Morse code in your browser. Adjust the speed and tone to match practice exam standards or vintage CW radio gear, then download the result as a WAV file you can use offline. How to Use Type or paste any letters, numbers, ...
Try the Tool »Paint Coverage Calculator Figure out exactly how much paint to buy before you head to the hardware store. The Paint Coverage Calculator turns your room dimensions into the number of litres or gallons you need and the exact number of cans to buy, with standard deductions for doors and windows, multi-coat support, and a waste ...
Try the Tool »Add IO tools to your favorite browser for instant access and faster searching
Scoreboard is a fun way to keep track of your games, all data is stored in your browser. More features are coming soon!
Update: Our latest tool was added on May 25, 2026
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