How to use CSS Minifier
- Paste CSS rules or an entire stylesheet.
- Run minify and note byte savings if displayed.
- Copy output to your production asset folder.
- Keep an unminified source file in version control.
Worked examples
Concrete numbers and cases you can check against the tool above.
Landing page CSS
Minify 40 KB custom CSS before inlining critical rules above the fold.
When to use CSS Minifier
Smaller CSS improves first paint on static sites without invoking Webpack for a one-off file.
Common use cases
- Ship a single critical CSS block inline.
- Prepare theme overrides for embedded widgets.
- Benchmark size of utility-first generated CSS.
- Bundle legacy CSS before HTTP/2 push experiments.
Inputs and outputs
- CSS3 syntax
- Minified single-line output
Privacy
This tool runs entirely in your browser. Your data never leaves your device — nothing is uploaded to our servers.
Frequently asked questions
- Does it rename classes?
- Basic minifiers do not shorten selectors unless configured for advanced modes.
- Are source maps generated?
- Not typically — rely on original files for debugging.
- Can @media queries break?
- Valid CSS stays valid; malformed input may concatenate rules wrongly.