Minify CSS code — remove comments, whitespace, and reduce file size instantly.
CSS Minifier is a free online tool that compresses CSS code by removing whitespace, comments, and unnecessary characters. The result is a smaller stylesheet that loads faster, reducing page load times and improving your website's performance metrics. The minification process removes all formatting whitespace including line breaks, tabs, and extra spaces. It strips CSS comments, shortens color values where possible, and removes unnecessary semicolons and whitespace around selectors and properties. The functional behavior of your CSS remains completely unchanged. Minified CSS is a standard best practice for production websites. Smaller CSS files mean faster downloads, quicker rendering, and better Core Web Vitals scores. This is especially important for mobile users on slower connections where every kilobyte of savings translates to measurable performance improvements. Everything runs entirely in your browser. Your CSS code is never uploaded to any server, ensuring complete privacy for your stylesheets, design systems, and client projects. There are no file size limits, no usage restrictions, and no account required. Common use cases include preparing stylesheets for production deployment, optimizing CSS for email templates, reducing the size of CSS frameworks before shipping, and compressing inline styles for performance-critical pages. The tool displays before-and-after statistics showing file size reduction, character count, and compression ratio. You can copy the minified CSS directly to your clipboard or download it as a file. For the reverse operation — making minified CSS readable — use the CSS Beautifier tool. For a complete optimization workflow, combine CSS minification with HTML and JavaScript minification.