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Small tools that do one job well.

20 free converters and calculators, each on its own address. Files never leave your device, there is nothing to sign up for, and every tool links to the others.

Convert — Files, units, money and timeCalculate — Money, health and datesDeveloper — Data, encoding and securityEveryday — Quick answers for daily life

1ImImage ConverterJPG, PNG, WebP, AVIF, BMP and ICO — batch convert and resize.2PdImages to PDFCombine JPG, PNG and WebP images into one PDF.3UnUnit ConverterLength, weight, temperature, volume, speed, data and more.4CuCurrency ConverterLive reference exchange rates for 160+ currencies.5TzTime Zone ConverterConvert times between cities, with a meeting planner.6TsUnix Timestamp ConverterEpoch seconds and milliseconds ↔ readable dates.7CoColor ConverterHEX, RGB, HSL and CMYK, plus a WCAG contrast checker.8PcPercentage CalculatorPercent of, % change, discounts, tips and markups.9LoLoan & Mortgage CalculatorPayments, total interest and amortization — Canadian mortgage rules.10BmBMI & Calorie CalculatorBMI, healthy weight range, BMR and daily calories.11AgAge & Date CalculatorExact age, days between dates, and date plus/minus days.12JsJSON FormatterFormat, validate and minify JSON; convert JSON ↔ CSV.13EnEncode & DecodeBase64, URL, HTML entities and JWT — encode or decode.14HaHash GeneratorMD5, SHA-1, SHA-256 and SHA-512 for text and files.15PwPassword GeneratorStrong random passwords and PINs, plus a strength checker.16WeWeatherCurrent conditions, hourly and 7-day forecast for any place.17QrQR Code GeneratorQR codes for links, Wi-Fi, contacts and more — PNG or SVG.18WoWord CounterWords, characters, reading time, keywords and case conversion.19IpWhat Is My IPYour public IP address, ISP, approximate location and browser.20RnRandom GeneratorRandom numbers, dice, coin flips, name picker and UUIDs.

Why these tools exist

Most “free online converters” upload your files, wrap a ten-second job in ads and pop-ups, and ask you to sign up before you can download. Every tool here runs in your own browser instead. Converting a photo, hashing a file or formatting JSON happens on your device, which is faster and keeps private files private.

Two tools need live data, and both use open, key-free services: Weather uses Open-Meteo and Currency uses Frankfurter, which publishes central-bank reference rates. What is my IP reads only the connection details your browser already sends.

Learn how they work

Each tool page explains the formula or format behind it. If you want to build tools like these yourself, the community list Build Your Own X collects step-by-step tutorials, and Public APIs lists free data sources you can call without a server.

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