CSS Minifier & Beautifier

Why Minify CSS?

CSS minification reduces file size by removing comments, whitespace, newlines, and redundant characters without changing how the CSS works. Smaller CSS files load faster, improving page speed and Core Web Vitals scores. This is especially important for mobile users on slower connections.

Most build tools (webpack, Vite, esbuild) minify CSS automatically in production. This tool is useful for one-off minification, quick tests, or when you don't have a build pipeline set up.

CSS Minification vs Beautification

Minification removes all formatting to produce the smallest possible output. Use it for production CSS files served to users.
Beautification adds consistent indentation, line breaks, and spacing to make CSS readable. Use it when you receive minified CSS and need to understand or edit it.

Both operations are lossless — they change the formatting but never alter the CSS rules themselves. Your styles will work identically before and after processing.

Frequently Asked Questions

What is CSS minification?

CSS minification removes comments, whitespace, and unnecessary characters to reduce file size without changing functionality. Minified CSS loads faster in browsers.

How much does minifying CSS save?

Typical savings are 10–40% depending on original formatting. Heavily commented and well-indented files see the largest reductions.

What's the difference between minify and compress?

Minification removes characters from source code. Compression (gzip/brotli) is applied at the server level. Use both together for best performance.

Does this support CSS variables and custom properties?

Yes. This tool works with all valid CSS including custom properties, @media queries, @keyframes, and all modern CSS features.

Is my CSS data safe?

Yes. Everything runs in your browser. Your CSS never leaves your device.