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, ...
Try the Tool »Stack Trace Formatter & Parser Paste a raw stack trace from JavaScript, Python, Java, Ruby, Go, .NET, or PHP and instantly get a colour-coded, frame-by-frame breakdown. The tool auto-detects the language, separates your code from framework noise, and produces a clean Markdown block that you can drop straight into a bug report or pull request. ...
Try the Tool »Macronutrient Calculator Turn a daily calorie goal into precise gram targets for protein, carbohydrates, and fat — split exactly the way you eat. Pick a preset diet (balanced, high protein, keto, endurance, zone) or drag the sliders to a custom split, then choose how many meals you eat per day. The calculator instantly returns grams ...
Try the Tool »Calculate the total floor area, the exact number of tiles, and the boxes to buy for any rectangular or L-shape room - with grout gap, wastage allowance, and metric / imperial units.
Try the Tool »Mock HTTP Response Builder Construct a structurally correct HTTP response message in seconds. Pick a status code, choose a body type, add headers, and the tool emits a ready-to-paste response string with the status line, headers, and body separated by CRLF — perfect for test fixtures, integration mocks, API documentation, and replaying responses against clients. ...
Try the Tool »QR Code Reader / Decoder Decode any QR code image directly in your browser. Drop a screenshot, photo, or saved image into the uploader and the tool returns the embedded text, URL, Wi-Fi credentials, contact card, or other payload — instantly and without sending the image anywhere. How to Use Click the upload area and ...
Try the Tool »Molar Mass Calculator Type a chemical formula and get the exact molar mass in g/mol, a per-element breakdown, and the mass percentage of each element. Atomic weights use IUPAC 2021 standard values so results are reliable for laboratory and coursework use. Parentheses, polyatomic groups, and hydrate notation (CuSO4·5H2O) are fully supported. How to Use Enter ...
Try the Tool »Docker Compose YAML Formatter Paste a docker-compose.yml and instantly get a clean, consistently formatted file with services, networks, and volumes ordered the way Docker Compose conventions expect. The formatter validates the file against the modern Compose Spec, flags deprecated keys like the old top-level version field or legacy links, and warns about unknown service options ...
Try the Tool »Dart Code Formatter Paste your Dart or Flutter source and instantly get a cleanly formatted version that follows the conventions enforced by dart format. The formatter runs entirely in your browser — no SDK install, no upload, and no waiting on a remote server. It is a fast, deterministic helper for every situation where you ...
Try the Tool »One-Rep Max (1RM) Calculator Estimate your one-rep max from any working set without ever loading a maximal attempt. Plug in the weight you lifted and the number of clean reps to failure, and the calculator returns five validated 1RM estimates (Epley, Brzycki, Lombardi, O’Conner, Wathan), the average across formulas, a percentage-of-1RM rep chart, and a ...
Try the Tool »Barcode Check Digit Validator Validate the check digit of any retail or shipping barcode in one paste. The validator auto-detects the format from the digit count, recomputes the expected check digit using the right algorithm — GS1 modulo-10 for EAN/UPC/GTIN, modulo-11 for ISBN-10 — and shows a position-by-position breakdown so you can see exactly where ...
Try the Tool »MIME Type Interactive Lookup Look up the correct MIME type for any file extension — or find the file extensions associated with a MIME type. Built on the IANA media type registry, this interactive lookup gives you instant, accurate results with category labels and one-click copying so you can drop the right Content-Type into your ...
Try the Tool »Country Info Lookup Look up authoritative metadata for every country in the ISO 3166-1 standard — names, codes, dialing prefixes, currencies, capitals, and TLDs — in one place. The tool ships with a bundled dataset of 249 countries and dependent territories, so every search is instant, accurate, and works fully offline in your browser. Unlike ...
Try the Tool »Time Zone Meeting Planner Find the best meeting window across multiple time zones at a glance. Add up to eight cities or IANA zones, pick a meeting date, and a color-coded 24-hour grid shows business hours, marginal slots, and night hours for every participant. Click any cell to lock in a moment and copy a ...
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 31, 2026
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