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All dev tools JSON formatter Base64 encoder decoder URL encoder decoder Regex creator Regex tester UUID generator JWT decoder Timestamp converter HTML entity encoder decoder JSON to CSV converter Text diff checker Color Converter Markdown Previewer Cron Builder Hash Generator Code Formatter
All common tools Character word counter Steps to km Calculator Percentage calculator Date difference calculator BMI calculator Age calculator Unit converter Password Generator IVA Calculator Countdown Timer QR Code Generator
All forbidden tools Useless button Do not click button Fake loading screen Excuse generator Compliment generator Moving Button Fake Windows Update Lie Detector Useless Horoscope Emergency Button
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RWT

RwebTool

Free online tools for developers and everyday use. Fast, simple and lightweight utilities to format, convert, validate and generate content directly in your browser.

Explore browser based tools designed for developers, everyday tasks and a few playful experiments, all without server calls.

16 Developer tool collection
12 Common tools collection
10 Curiosity corner

Dev tools

Fast browser tools for encoding, testing, conversion and small debugging jobs.

All dev tools Discover client side dev utilities for encoding, regex, debugging and quick data transforms. JSON formatter Format, validate and minify JSON quickly and easily. Base64 encoder decoder Encode or decode Base64 strings, files or API payloads directly in your browser. Regex tester Test regular expressions with live matches, flags and clear feedback. JWT decoder Inspect JWT headers, payloads and expiration data without sending tokens anywhere. Text diff checker Compare two text blocks and spot line level changes in seconds. Color Converter Convert between HEX, RGB and HSL color formats with a live preview swatch. Markdown Previewer Write Markdown and see the rendered HTML preview update in real time. Cron Builder Build cron expressions visually and get a human-readable description instantly. Hash Generator Compute SHA-1, SHA-256, SHA-384 and SHA-512 hashes client-side. Code Formatter Minify or beautify HTML, CSS, JavaScript and JSON directly in your browser.

Common tools

Useful calculators and converters for text, numbers, dates and small daily tasks.

All common tools Open daily use tools for numbers, text and simple conversions that work fast on mobile and desktop. Character word counter Count characters, words, sentences and reading time with live updates. Calculator Use a fast clean calculator for everyday math and quick checks. Percentage calculator Calculate percentage changes, growth rates and discount values without spreadsheets. Date difference calculator Measure the time between two dates for planning deadlines and events. Unit converter Convert units for length, weight and temperature in one place. Password Generator Generate strong, random passwords with custom length and character sets. IVA Calculator Calculate Italian VAT from net or gross amounts at 4%, 10% and 22% rates. Countdown Timer Set a target date and watch the live countdown in days, hours, minutes and seconds. QR Code Generator Turn any text or URL into a downloadable QR code in one click.

Forbidden tools

A playful corner with useless buttons, fake loading bars and intentionally unnecessary fun.

All forbidden tools Open the playful corner of the site for pointless buttons, fake progress and other curiosity traps. Useless button Press a button that refuses to improve your productivity but comments on it. Do not click button Ignore the warning and unlock a series of mock consequences and jokes. Fake loading screen Launch a fake loading experience full of dramatic progress updates. Compliment generator Generate over the top compliments for yourself, your team or your duck debugging partner. Moving Button Try to click the button that keeps running away from your cursor. Fake Windows Update Prank your colleagues with a convincing full-screen Windows Update overlay. Lie Detector Submit any statement and let our advanced pseudo-AI expose the truth. Useless Horoscope Get your daily horoscope — guaranteed to be vague, absurd and completely useless. Emergency Button Press the big red button for maximum drama, alarm sounds and a 10-second countdown.