Developer Tools
Free developer tools. Format and validate JSON, encode Base64 and URLs, test regular expressions, pick colors and generate UUIDs.
All Developer tools
JSON Formatter
Format, validate and minify JSON with clear error positions.
Base64 Encode / Decode
Convert text and files to Base64 and back, with URL-safe output.
URL Encode / Decode
Percent-encode and decode URLs, query strings and path segments.
HTML Formatter
Beautify or minify HTML with consistent indentation.
Regex Tester
Test regular expressions live with match highlighting and capture groups.
JSON Tree Viewer
Explore large JSON as a collapsible tree, with search and copyable key paths.
JWT Decoder
Decode a JSON Web Token's header and payload, and verify an HMAC signature.
UUID Generator
Generate v4 and v7 UUIDs in bulk, ready to copy.
Markdown to HTML
Convert Markdown to clean, semantic HTML with a live preview.
HTML Encode / Decode
Convert characters to HTML entities and back, to display markup safely as text.
URL Slug Generator
Turn any title into a clean, readable URL slug — accents folded, punctuation gone.
Code to Image
Turn a code snippet into a shareable image, with syntax highlighting and themes.
JavaScript Formatter
Beautify JavaScript or TypeScript with Prettier, including JSX.
JavaScript Minifier
Real minification via Terser — dead-code elimination and identifier mangling.
CSS Formatter
Beautify CSS, SCSS or Less with consistent indentation, using Prettier.
CSS Minifier
Strip comments and whitespace from CSS, and shorten hex colours and zero units.
CSS Gradient Generator
Build linear, radial and conic CSS gradients visually and copy the code.
CSS Box Shadow Generator
Build layered CSS box shadows visually, including inset and glow, and copy the code.
CSV to JSON Converter
Convert CSV to JSON and back, with proper quoting, type inference and a table preview.
React Native Shadow Generator
Generate matching iOS and Android shadow styles for React Native, with a preview.
SHA-256 Hash Generator
Generate a SHA-256 hash for text or files, with HMAC signing and checksum verification.
MD5 Hash Generator
Generate an MD5 checksum for text or files, and verify a download against a known digest.
SHA-1 Hash Generator
Generate a SHA-1 hash for text or files, with a checksum comparison and HMAC mode.
SHA-512 Hash Generator
Generate a SHA-512 hash for text or files, with HMAC signing and checksum verification.
SHA-384 Hash Generator
Generate a SHA-384 hash for text or files, with HMAC signing and checksum verification.
SHA-224 Hash Generator
Generate a SHA-224 hash for text or files, and compare it against a published checksum.