CSS Minifier Online

CSS files pick up extra weight fast — comments left in from development, inconsistent spacing, and line breaks that make sense for editing but serve no purpose once the file is live. This tool strips all of that out, shrinking the file without changing what it does.

What actually gets removed

Comments (/* like this */) are deleted entirely, all line breaks and repeated whitespace are collapsed, and the spacing around braces, colons, semicolons, and commas is removed. The trailing semicolon before a closing brace is also dropped, since it's redundant. On a typical stylesheet this brings the file down by roughly 30-50%.

Client-side, nothing uploaded

The minifying happens directly in your browser using JavaScript — your CSS is never sent to a server. This matters if you're working with an unreleased design system or anything under an NDA.

One thing to know

Minifying doesn't change how the CSS behaves — visually, the page renders identically before and after. If you need to debug or read through minified CSS from somewhere else, use the CSS Formatter instead, which does the opposite: it expands compressed code back into a readable, indented format.

FAQ

Does minifying break my CSS? No. Only whitespace, comments, and redundant characters are removed — every selector, property, and value stays exactly the same.

How much smaller will my file get? It depends on how much whitespace and how many comments the original had, but 30-50% smaller is typical for a normally-formatted stylesheet.