Free developer tools
Handy utilities for everyday development: format and validate JSON, encode and decode Base64 and URLs, generate UUIDs, decode JWTs, test regular expressions and create QR codes. Everything runs locally in your browser.
JSON Formatter
Format, minify and validate JSON with clear error messages.
Base64 Encoder / Decoder
Encode and decode Base64, including URL-safe and UTF-8 text.
URL Encoder / Decoder
Percent-encode or decode URLs and query strings.
UUID Generator
Generate random v4 UUIDs in bulk.
JWT Decoder
Decode JWT headers and payloads and check expiry. Nothing is sent anywhere.
Regex Tester
Test regular expressions with live match highlighting and groups.
QR Code Generator
Create QR codes for links, text, Wi-Fi and more. Download as PNG.