CSS Minifier

What CSS minification actually removes

Minifying CSS strips everything a browser does not need to render your styles correctly: comments, line breaks, indentation, and the extra spaces around braces, colons, semicolons and commas. None of that whitespace changes what the CSS does, it only exists to make the file readable to a human editing it, so removing it shrinks the file with zero effect on how the page looks or behaves.

How much this typically saves

The savings depend heavily on how the original CSS was formatted. A file written with generous indentation, comments and one property per line, common in hand-written stylesheets, often shrinks by 15 to 30 percent. A file that was already compact to begin with will save less, since there is less whitespace left to remove.

What this tool does not do

This is whitespace and comment minification only, it does not rename CSS classes, merge duplicate rules, or reorder selectors, all of which are more aggressive optimizations that can change behavior if done incorrectly. For most sites, stripping comments and whitespace captures the bulk of the easy, risk-free savings.