About the CSS Minifier
Large stylesheets slow down page rendering. Our CSS minifier strips all irrelevant spaces, newlines, and comments to produce a lightweight string that browsers can parse significantly faster.
CSS Minifier
Minify CSS files for faster page loads.
100% Local Processing
How to minify CSS
- Paste the stylesheet or CSS fragment into the editor.
- Run the minifier and inspect the compressed declarations and selectors.
- Use the output in a test build first, then verify media queries, custom properties, strings, and calc expressions.
Examples and worked results
Simple declaration
Input
.card { color: #333; padding: 16px; }Result
.card{color:#333;padding:16px}Comments and unnecessary whitespace are removed while quoted values and protected syntax are retained.
What this minifier changes
The browser-side cleaner removes comments and collapses safe whitespace around CSS punctuation. It does not perform a full stylesheet optimisation pass such as selector merging, dead-code removal, or vendor-prefix analysis.
Common use cases
- Checking the compact form of a small stylesheet
- Preparing snippets for a demo or email template
- Comparing readable and compressed CSS during debugging
Important notes and limitations
- A heuristic cleaner is not a substitute for a mature production build pipeline.
- Test custom properties, data URLs, calc expressions, and unusual syntax before shipping the result.
Frequently Asked Questions
Will this break my `@media` queries?
No, it carefully preserves necessary syntax elements while aggressively stripping spaces.