CSS Beautifier and Minifier

CSS delivered to the browser does not need to be human-readable. Minified stylesheets load faster, parse faster, and reduce bandwidth — especially on mobile connections. This tool lets you compress CSS for production or expand it for editing.

When to beautify CSS

Generated or framework CSS is often hard to read as-is. Beautifying expands the stylesheet into a consistent, well-indented format so you can understand selectors, spot redundant rules, and make targeted edits. It is also useful when copying CSS from browser DevTools, which outputs rules on a single line.

When to minify CSS

Every byte of CSS blocks rendering. Minified stylesheets reduce the amount of data the browser must download and parse before it can display content. A typical stylesheet shrinks 20–40% with whitespace removal alone, and more when value optimizations are applied.

Powered by LightningCSS

Minification uses LightningCSS, a modern Rust-based CSS parser also used by Vite. It applies all safe optimizations automatically: collapsing shorthand properties, removing redundant vendor prefixes, and simplifying color values. The output is semantically identical to the input. Beautification uses js-beautify. Both libraries run on the server — your code is never stored.