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What is CSS Minifier & Beautifier?

Free CSS minifier and beautifier. Paste your CSS to minify it for production or beautify it for readability. See byte savings instantly. No upload, no signup.

No file uploadsNo tracking of inputsNo account requiredWorks offline after first load

CSS Minifier runs entirely in your browser using JavaScript (browser). Your data never leaves your device.

Free CSS Minifier & Beautifier

Minify CSS for production to remove whitespace, comments, and redundant semicolons — shrinking file sizes by 30–70%. Or beautify minified CSS to make it human-readable again. The tool shows character count before and after and the exact byte savings. Everything runs in your browser — your code never leaves your device.

Free to embed on your website · No signup required
480 bytes
480 bytes in→362 bytes out🎉 25% smaller
Free to embed on your website · No signup required

Frequently Asked Questions

Typical CSS files shrink 30–70% after minification. The exact savings depend on how much whitespace, comments, and formatting the original file contains. Minified CSS loads faster and reduces bandwidth costs.
Minification removes: whitespace (spaces, tabs, newlines), CSS comments (/* ... */), trailing semicolons before closing braces, and redundant spaces around selectors and property separators.
No. Minification only removes characters that have no effect on how the browser interprets the CSS. The rendered output is identical to the original.
Use the beautifier when you receive minified CSS (e.g., from a framework or third-party library) and need to read or debug it. It adds consistent indentation and line breaks to make the structure visible.
The tool preserves all vendor prefixes (-webkit-, -moz-, -ms-) exactly as written. It minifies without removing or altering property names.

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Why Minify CSS?

Every byte of CSS the browser downloads delays rendering. Minification strips whitespace, comments, and redundant characters that are meaningful to humans but invisible to browsers. A typical stylesheet shrinks 30–70% after minification. Combined with gzip or Brotli compression (which most web servers apply automatically), minified CSS compresses even further — often to 10–20% of the original size. For a 50 KB stylesheet, that can mean 40 KB less per page load, which directly improves Core Web Vitals metrics like First Contentful Paint.

Minification vs. Compression

Minification and server-side compression are complementary, not alternatives. Minification removes unnecessary characters before the file is sent. Compression (gzip/Brotli) then compresses the minified file during transfer. Running both gives the best results. CSS bundlers like Vite, Webpack, and esbuild minify CSS automatically in production mode — use this tool for one-off files, legacy projects, or CSS you receive without a build pipeline.

CSS Minification in Build Pipelines

For projects with a build step, integrate CSS minification into your pipeline. Vite and Next.js minify CSS automatically in production builds. For standalone CSS, tools like cssnano, clean-css, or lightningcss can be added as PostCSS plugins. This tool is ideal for quickly checking savings on a specific file, processing one-off CSS without a full build setup, or recovering a readable version from minified third-party CSS.