Minify CSS
Makes a CSS file smaller by removing whitespace and comments.
How to use it
- Drag your .css files onto the area above, or press "Choose files".
- If options are shown, set them as you like. They appear below the file list.
- Press "Convert". The conversion runs on your device, shows its progress and can be cancelled at any time.
- Press "Download" next to a result. With several results, "Download all as ZIP" gets them in one go.
The formats involved
CSS .css
CSS is the style sheet language that sets how a web page looks, such as colours, fonts and layout. A CSS file is a text file containing those rules.
Limits and things to watch for
- The file size that can be processed depends on your device. The limit for your device is shown in the drop area, and files above it are refused with a message.
FAQ
Is my file uploaded to a server?
No. Conversion happens only inside this browser, and file names, contents and results are not sent to our servers. Some converters download their conversion program (code) the first time you use them; your files are not sent then either. See the privacy page for details.
Licences and the software used
Programs this converter downloads and uses: csso 5.0.5 (MIT) · Open-source licenses
Sources and check date
This converter works with ordinary processing rules and does not rely on an outside reference document.
Date we opened the original documents ourselves: 2026-11-10. Specifications can change, so read the original again before anything important.