Developer Tools
Everyday utilities for developers, testers and anyone who works with data. Pretty-print and validate API responses with the JSON formatter, encode and decode text or files with Base64, and fix query strings with the URL encoder. Create strong credentials with the password generator and unique IDs with the UUID generator.
Verify downloads and compare files with the hash generator (MD5, SHA-1, SHA-256 and SHA-512), and move between HEX, RGB and HSL with the colour converter, which also checks text contrast. Every tool runs entirely in your browser: nothing you paste, including passwords, tokens and private JSON, is sent to a server, so they are safe for work data too. The tools are free, need no sign-up and work on phones as well as computers.
- JSON Formatter & ValidatorFormat, validate and minify JSON instantly. Choose 2 or 4 spaces or tabs, sort keys and see the exact line of any error. Private, runs in your browser.
- Base64 Encode & DecodeEncode text to Base64 or decode Base64 back to text, with full Unicode support and URL-safe output. Convert files to Base64 data URLs. Free.
- URL Encode & DecodePercent-encode text for URLs and query strings, or decode %20-style URLs back to readable text. Shows query parameters in a table. Free and private.
- Password GeneratorGenerate strong random passwords with your choice of length, letters, numbers and symbols. Shows strength in bits. Made in your browser, never stored.
- UUID GeneratorGenerate random version 4 UUIDs (GUIDs) instantly, one or up to 1,000 at a time, in lowercase or uppercase, with or without hyphens. Free.
- Hash Generator (MD5, SHA-256)Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or files, and verify a download against its checksum. Free, private, no upload.
- Color Converter (HEX, RGB, HSL)Convert colours between HEX, RGB and HSL, pick from a colour picker and check text contrast against white and black. Copy CSS values in one click.