How much smaller does CSS get?

Typically 20–40% — depending on how heavily commented and indented the source is. Combine with gzip/brotli on the server for further savings.

Will minified CSS break my site?

For valid CSS, no. The transform only removes comments and unnecessary whitespace. Always test minified output in a staging environment.

Files never leave your device

Minify CSS by removing comments, whitespace, and unnecessary semicolons. See input/output sizes and savings percent.

Input CSS — 124 bytes

Minified — 86 bytes (saved 38 bytes / 30.6%)

.btn{background:red;padding:12px 24px;border-radius:4px}.btn:hover{background:darkred}