CSS Minifier
To minify CSS, paste your stylesheet and click Minify: CSSO removes whitespace and comments, shortens colours and values, and merges duplicate rules where it is safe, showing the size before and after.
- Free
- No signup
- Runs in your browser
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How to use CSS Minifier
- 1Type or paste your input into the CSS Minifier.
- 2Choose any options you need.
- 3See the result update instantly.
- 4Copy the result or download it.
CSS Minifier: questions people ask
Will minifying change how my site looks?
No. CSSO only applies safe optimisations that keep the same rendering.
Are /*! license */ comments kept?
Yes. Comments starting with /*! are preserved.
Is my data uploaded when I use the CSS Minifier?
No. The CSS Minifier runs entirely in your web browser, so your text and numbers stay on your device and work even on a slow connection.
Does the CSS Minifier work on iPhone, Android and Mac?
Yes. The CSS Minifier runs in any modern browser (Safari, Chrome, Edge or Firefox) on iPhone, iPad, Android phones, Mac, Windows and Chromebook. There is no app to install.
Is the CSS Minifier free?
Yes. The CSS Minifier is free with no signup, no watermark and no daily limit.