Free Online Developer Tools

Encode text, inspect JWTs, generate hashes, parse query strings and create random UUIDs or passwords. Copy or download results directly in your browser.

All developer tools

Base64 Encoder / Decoder
Encode and decode UTF-8 text with standard or URL-safe Base64.
URL Encoder / Decoder
Encode or decode URL components and form values, with strict error reporting.
JWT Decoder
Inspect JWT contents and expiry time
Hash Generator
Calculate SHA-256, SHA-384 or SHA-512 hashes of UTF-8 text using Web Crypto.
HTML Encoder / Decoder
Escape HTML special characters or decode named and numeric HTML entities.
Query String Parser
Parse a URL or query string into JSON while retaining repeated parameter values.
String Escape / Unescape
Escape text as a JSON string or decode a quoted JSON string without evaluating code.
UUID Generator
Generate one or a batch of cryptographically random UUID v4 identifiers.
Password Generator
Generate random passwords with chosen character sets, length and batch size.