CSS Minifier

CSS files typically include comments, indentation, and blank lines for human readability, none of which affect how a browser applies the styles — a browser's CSS parser ignores that formatting entirely once the file is parsed into rules. Minifying CSS strips exactly that unnecessary content — comments, extra whitespace, and redundant line breaks — leaving only what's needed to express the same rules.

This matters for page performance, since CSS is typically render-blocking: the browser has to download and parse a page's CSS before it can safely paint content, so a smaller CSS file, especially over a slow connection, can measurably speed up perceived load time. It's standard practice to keep readable, commented CSS in source files and minify automatically at build or deploy time rather than by hand.

This tool performs conservative, whitespace-level minification — removing comments and unneeded spacing — rather than more aggressive optimizations like merging duplicate selectors, shortening color values, or removing unused rules, which require deeper analysis of the stylesheet and how it's used. For those transformations, a build-tool-integrated minifier is a better fit.