Sometimes you just need to format a JSON response, decode a JWT to see what’s inside, or turn a Unix timestamp into a readable date. Other times you’re generating UUIDs for a script, checking a password strength, or converting HEX to RGB. The tools here do that—and they do it in your browser. Nothing you paste or generate is sent to our servers. That’s deliberate: when you’re dealing with tokens, snippets, or real user data, you don’t want it leaving your machine.
You’ll find a JSON formatter (and validator), Base64 encode/decode, JWT decoder, UUID generator, timestamp converter, password strength checker, color converter and picker, and a code minifier for JavaScript and CSS. We use them ourselves when debugging APIs or whipping up a quick prototype. No accounts, no rate limits for normal use—just open the page, paste or type, and get the result.
If you’ve ever been on a call and needed to decode a token or convert a timestamp, you know how useful a single-purpose tool can be. These are that: fast, focused, and private. Bookmark the ones you use most; we add new utilities from time to time based on what developers ask for.
JSON Formatter
Format, validate, minify, and auto-fix JSON online. Instant syntax error detection with line numbers and built-in search.
Use calculatorBase64 Encoder/Decoder
Encode text to Base64 or decode Base64 back to plain text instantly. Supports UTF-8 and one-click copy.
Use calculatorJWT Decoder
Decode and inspect JSON Web Tokens online. View header, payload, claims, and expiration instantly.
Use calculatorUUID Generator
Generate random UUID v4 identifiers instantly. Copy single or bulk UUIDs for databases, APIs, and distributed systems.
Use calculatorTimestamp Converter
Convert Unix timestamps to human-readable dates and dates to timestamps. Supports seconds and milliseconds formats.
Use calculatorPassword Strength Checker
Test password strength in real time. See crack-time estimates, character requirements, and tips to create stronger passwords.
Use calculatorColor Converter
Convert colors between HEX, RGB, and HSL formats instantly. See live color preview and copy any format with one click.
Use calculatorColor Picker
Pick colors visually and get HEX, RGB, HSL, CMYK codes. Explore color harmonies, shades, and copy any format instantly.
Use calculatorCode Minifier
Minify JavaScript and CSS code to reduce file size. Remove whitespace, comments, and line breaks while preserving functionality.
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