CSS Minifier

What is a CSS Minifier?

A CSS minifier removes unnecessary characters from your stylesheet — whitespace, comments, and redundant syntax — without changing how it renders. Smaller CSS files load faster, which improves page speed and Core Web Vitals.

How to minify CSS

Paste your CSS and click minify. The tool strips comments and whitespace instantly, all in your browser. Minifying is a standard step in web performance optimization alongside JavaScript compression.

Why minify matters

Minified CSS reduces download size and parse time, which matters for mobile users and slow connections. Combined with gzip, minification is one of the easiest performance wins.

CSS minifier FAQ

Will minifying break my site? No, if your CSS is valid. Is it reversible? You can keep the original as a comment. Does it run locally? Yes, nothing is uploaded.