CSS Minifier

A CSS minifier removes unnecessary characters — like whitespace, comments, and redundant syntax — from a stylesheet without changing how the browser renders it. The result is a smaller file that downloads faster.

Yes. All processing happens entirely in your browser (client-side). Your CSS is never uploaded to a server, so it stays completely private and secure.

You can toggle: remove comments, collapse whitespace, remove empty rules, remove trailing semicolons, remove zero units (0px → 0), shorten hex colors (#ffffff → #fff), shorten font-weight values (normal → 400), remove quotes from url(), and remove leading zeros (0.5 → .5).

No. The minifier only removes characters that the browser ignores anyway — extra whitespace, comments, and redundant syntax. It does not alter actual property values or selectors in a way that changes rendering.

Typical savings range from 10% to 40%, depending on how verbose your original CSS is. The tool shows real-time byte count and percentage reduction so you can see the exact savings instantly.

Yes. Click the 'Upload .css' button to load a stylesheet directly from your computer. You can also download the minified result as a .css file.

This tool is designed for pure CSS. If you have CSS embedded in HTML, you should first extract the CSS, minify it here, and then paste it back. For full HTML minification including inline CSS, use our HTML Minifier tool.

Yes. The minifier preserves CSS custom properties (--var-name) and their values correctly. It will not alter or remove CSS variables.

This is a browser tool for quick, one-off minification. For production build pipelines, use dedicated tools like cssnano, clean-css, or esbuild which integrate with bundlers like Webpack, Vite, and Rollup.