Guides ·
How to use CSS Minifier
CSS Minifier. Minify CSS with CSSO optimisation. No. CSSO only applies safe optimisations that keep the same rendering.
The short answer
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.
It runs in your browser. What you enter is not uploaded.
How to use it
Type or paste your input into the CSS Minifier.
Choose any options you need.
See the result update instantly.
Copy the result or download it.
Limits worth knowing
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.