Compress your CSS stylesheets by removing comments, whitespace, and redundant characters to achieve smaller file sizes.
The CSS Minifier is a free browser-based tool that optimizes your CSS code by stripping out block comments, collapsing unnecessary whitespace, removing spaces around selectors and properties, and eliminating trailing semicolons before closing braces. The result is a compact stylesheet that behaves identically to the original.
Front-end developers and designers regularly minify CSS as part of their build process. Smaller stylesheets download faster, reduce render-blocking time, and contribute to better Core Web Vitals scores. This is especially impactful for mobile users on slower connections where every kilobyte counts.
Paste your CSS into the editor and click the minify button. The tool processes everything locally in your browser — nothing is uploaded to any server. You'll instantly see the compressed output along with byte-level statistics showing the exact reduction achieved.
Use this tool whenever you need to quickly minify a stylesheet without setting up a build pipeline. It handles any valid CSS input and produces clean, production-ready output that you can copy and deploy immediately.