Developer Tools
Free online developer tools that run entirely in your browser: generators, formatters, encoders and validators. No signup, no uploads, no limits.
- Developer Tools
Base64 Encoder & Decoder
Encode text to Base64 and decode it back, right in your browser. Handles Unicode correctly and never sends your data anywhere.
- Developer Tools
HTML Entity Encoder
Encode text into HTML entities or decode entities back to characters. Escapes the five characters that break markup, safely in your browser.
- Developer Tools
JSON Formatter
Format, validate and minify JSON in your browser. Paste messy JSON, get readable output with a clear message when something is wrong.
- Developer Tools
JWT Decoder
Decode a JSON Web Token to inspect its header and payload, and check the expiry — all in your browser, with no token ever sent.
- Developer Tools
Password Generator
Generate strong random passwords in your browser. Choose the length and character types, then copy — nothing is ever sent over the network.
- Developer Tools
SHA Hash Generator
Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text, computed in your browser with the built-in Web Crypto API.
- Developer Tools
URL Encoder & Decoder
Encode text for safe use in URLs and decode percent-encoded strings back. Handles full URLs and individual query components.
- Developer Tools
UUID Generator
Generate random UUID v4 identifiers instantly in your browser. Create one or thousands at once, then copy them with a single click.