Developer tools
Format, validate, encode and debug common developer data — entirely in your browser.
14 tools
JSON Formatter
Format, validate, minify and beautify JSON instantly in your browser.
Use Tool →JSON Validator
Check whether a JSON string is valid and see clear error messages.
Use Tool →Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to text.
Use Tool →URL Encoder / Decoder
Encode or decode URL query strings and path segments safely.
Use Tool →UUID Generator
Generate UUID v4 identifiers for apps, databases, and APIs.
Use Tool →JWT Decoder
Decode JWT header and payload locally. Does not verify signatures.
Use Tool →Regex Tester
Test regular expressions against sample text with live match highlights.
Use Tool →Hash Generator
Generate SHA-256, SHA-384, or SHA-512 hashes from text in the browser.
Use Tool →Timestamp Converter
Convert Unix timestamps to human dates and back.
Use Tool →Color Converter
Convert between HEX, RGB, and HSL color formats.
Use Tool →Markdown Preview
Write Markdown and preview rendered HTML side by side.
Use Tool →HTML Formatter
Beautify HTML indentation for readability.
Use Tool →CSS Formatter
Beautify or minify CSS for development and delivery.
Use Tool →JavaScript Formatter
Indent JavaScript for readability (best-effort beautify).
Use Tool →Why use developer tools here?
Every tool in this category runs in your browser when possible — so you get speed, privacy and no forced signup. Results stay on your device unless a tool clearly says otherwise.
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