What is CSS Minification?
CSS minification is the process of removing all unnecessary characters from CSS code — including comments, whitespace, newlines, and redundant semicolons — without changing its functionality. The result is a smaller file that loads faster, directly improving your website's performance and Core Web Vitals scores.
A typical CSS file can be reduced by 20–60% through minification. For large stylesheets, this can save tens of kilobytes of data per page load, which is especially significant for mobile users on slower connections. All modern build tools (webpack, Vite, Parcel) minify CSS automatically in production builds, but this tool lets you do it manually for any file.
FAQ
Will minification break my styles?
No. CSS minification only removes formatting characters that don't affect how styles are applied. The browser parses minified and beautified CSS identically. Always test on a staging environment first for complex stylesheets.
Should I serve minified or original CSS?
Always serve minified CSS in production. Keep the original source file for development. Modern build tools handle this automatically, but for static sites or quick projects, this tool gives you a minified version you can deploy immediately.