Jsonnet Formatter & Evaluator Paste Jsonnet source and get a fully evaluated JSON result, or pretty-print the source itself. This tool runs entirely in your browser, so your configuration never leaves the page. Handy for previewing Kubernetes manifests, Grafana dashboards, Tanka environments, or any other config-as-code expressed in Jsonnet. How to Use Paste Jsonnet code ...
Try the Tool »HJSON Formatter & Validator Paste HJSON — the human-friendly variant of JSON that allows comments, unquoted keys and strings, multiline values, and trailing commas — and convert it to strict JSON instantly. The tool also runs the conversion in reverse: drop in strict JSON and get a cleaner HJSON version with unquoted keys for easier ...
Try the Tool »Moon Phase Calculator The Moon Phase Calculator shows you exactly what the Moon looks like on any date from 1900 to 2100. Pick a day and instantly see an accurate moon disc, the phase name, illumination percentage, the Moon’s age in the current lunar cycle, and how many days remain until the next new and ...
Try the Tool »Color Swatch Sheet Generator Paste a list of colors and instantly preview them as a printable swatch sheet with hex labels. Mix any CSS color format you like — short and long hex, rgb(), rgba(), hsl(), hsla(), or named colors such as tomato — then download the sheet as a high resolution PNG or scalable ...
Try the Tool »Elixir Code Formatter Paste your Elixir source code and get clean, mix format-style output instantly in your browser. Standardize indentation, normalize spacing around operators, sort alias / import / require / use blocks, and surface syntax problems before they reach iex. Everything runs client-side, so your code never leaves your machine. How to Use Paste ...
Try the Tool »Decibel (dB) Level Converter The Decibel (dB) Level Converter turns a value entered in one decibel or linear unit into every related representation. Pick a reference type — Sound Pressure Level (SPL), Voltage, or Power — choose what your input is, and the tool computes the equivalent dB readings, the underlying linear quantity (pascals, volts, ...
Try the Tool »Irregular Polygon Area Calculator Type a list of vertex coordinates and instantly get the area, perimeter, and centroid of any flat polygon — convex or concave, axis-aligned or skewed, three vertices or thirty. The calculator uses the classic Shoelace formula so the answer is exact (no triangulation, no approximations), and it draws a live SVG ...
Try the Tool »Unified Color Space Converter Paste a color in any common format and instantly see it represented across nine color spaces side by side. The converter auto-detects HEX, RGB, HSL, HSV/HSB, CMYK, CIE LAB, LCH, CIE XYZ, Oklab, and CSS named colors, then computes every other representation using full sRGB gamma correction and the standard D65 ...
Try the Tool »XML Diff Comparator Compare two XML documents at the node level or the line level. The XML Diff Comparator highlights added, removed, modified, and attribute-level changes so you can spot exactly what changed without skimming through thousands of tags by eye. Unlike plain text diff tools, this comparator understands XML structure: it ignores cosmetic whitespace, ...
Try the Tool »Syllable Counter & Poetry Analyzer Paste any text, lyric, or poem and instantly see how many syllables each word and line contains. The tool also validates classic forms — haiku (5-7-5), tanka (5-7-5-7-7), and limerick (8-8-5-5-8) — and can highlight estimated stressed syllables so you can audit the meter of your verse. Unlike a chat-based ...
Try the Tool »NPV & IRR Calculator Evaluate an investment opportunity the way finance professionals do. This calculator turns a stream of yearly cash flows into the four numbers that matter most for any capital-budgeting decision: Net Present Value (NPV), Internal Rate of Return (IRR), Modified IRR (MIRR), and the Profitability Index. It also reports the simple and ...
Try the Tool »CSS Custom Property Extractor Paste any CSS or SCSS stylesheet and instantly get a clean, sorted, deduplicated list of every --custom-property declared in it — along with the selector scope it was declared in. The extractor also surfaces variables that are referenced via var(--name) but never declared anywhere, which are a common cause of broken ...
Try the Tool »Image to ASCII Art Converter Turn any photo, screenshot or logo into ASCII art directly in your browser. Upload an image and the converter samples each region of pixels, maps the brightness to a character of matching density and assembles the result into monospaced text you can paste anywhere — chat windows, code comments, terminals, ...
Try the Tool »tsconfig.json Generator Build a valid tsconfig.json for TypeScript projects without memorising option names or hunting through release notes for what changed in the latest compiler. Pick a preset (Node ESM, Node CommonJS, React, Next.js, Library, or Strictest), tweak the strictness toggles, add any path aliases, and copy the generated JSON into the root of your ...
Try the Tool »Textile & Yarn Converter Cross-reference knitting needle sizes, crochet hook sizes, and yarn weight categories across US, UK/Canada, metric, and Japanese standards in one place. Useful when a pattern from one country lists a needle or yarn name that does not match what is printed on your local supplies. How to Use Pick a category ...
Try the Tool »Maze Generator (SVG) Generate random perfect mazes as crisp, scalable SVG images directly in your browser. Pick a classic carving algorithm, set the grid size, optionally fix a seed for reproducible output, and download the result as SVG or PNG. Every maze is built from real graph theory — not a stock template — so ...
Try the Tool »Network Speed Unit Converter Instantly convert between every common network and data transfer rate unit – bps, Kbps, Mbps, Gbps, Tbps, B/s, KB/s, MB/s, GB/s, TB/s, plus the binary IEC units like KiB/s and MiB/s. Type a value into any field and every other field updates live, so you never have to guess whether a ...
Try the Tool »JavaScript Code Formatter Paste minified, messy, or compressed JavaScript and get back a clean, consistently formatted version you can actually read. The formatter is token-aware — it understands string literals, template literals, regular expressions, and comments, so it never accidentally reformats the inside of a regex or rearranges your ${...} interpolations. Everything runs in your ...
Try the Tool »Pregnancy Due Date Calculator Estimate your baby’s due date instantly from your last menstrual period, conception date, or IVF transfer date. Get your current gestational age, trimester, progress toward 40 weeks, and a complete timeline of key prenatal milestones and appointment windows — all calculated in your browser with no data sent to a server. ...
Try the Tool »ICS Calendar Event Generator Build a standards-compliant .ics calendar file in seconds, then download it or copy the raw iCalendar text. Fill in the event details, choose a timezone and an optional repeat rule, add a reminder, and you get a clean RFC 5545 file that imports cleanly into Apple Calendar, Google Calendar, Outlook, Fastmail, ...
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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 29, 2026
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