Web & Code

Format or minify JavaScript

Format, optimize, and minify CSS code

Format, optimize, and minify HTML code

Test regular expressions interactively

Decode minified stack traces with source maps

Convert colors across CSS, mobile, and design-token formats

Write frontend code, run it safely, and debug the result in your browser.

Convert SVG markup into clean React JSX or TSX components

Browse curated CSS gradients or build linear, radial, and conic ones

Write WAT, compile it to WebAssembly, inspect the binary, and call exported functions locally.

Build lockable harmony palettes, OKLCH tonal scales and design tokens

Build Flexbox layouts visually and copy CSS, HTML or Tailwind

Format or safely minify SQL in eight dialects without touching string literals

Estimate time and space complexity in 14 languages with confidence and evidence. Syntax trees for JS, TS and Python; bounded heuristics for other languages.

Inspect PHP serialized values safely without executing PHP code

Inline CSS into email HTML with a correct cascade, kept media queries and a safe preview

Check text and UI color contrast against WCAG 2.2 AA and AAA, then fix failing pairs

Build Apache .htaccess redirects, caching and security rules with conflict checks

Build CSS Grid layouts visually and copy clean CSS and HTML

Design confetti animations and copy lightweight HTML, CSS and JS

Error chains, root cause and app frames from any stack trace

Tested regex patterns for every language