CSS Minifier
Remove unnecessary whitespace and comments from CSS code directly in your browser.
How to Use the CSS Minifier
Paste valid CSS and minify it to remove unnecessary whitespace and line breaks before deployment.
Practical Example
A multi-line rule for a button can be compressed into a compact single-line declaration while keeping the same styles.
Factors That Affect the Result
Comments, whitespace-sensitive hacks, malformed CSS and unusual syntax can influence minification quality.
Frequently Asked Questions
Does minifying CSS change the design?
Valid minification should preserve the same visual rules.
Why minify CSS?
Smaller stylesheets can reduce transfer size and improve delivery efficiency.
Can I format minified CSS again?
Yes, use the CSS Formatter.
Related Tools
What CSS Minification Changes
CSS minification reduces file size by removing characters that are unnecessary for browsers to interpret the stylesheet, such as extra whitespace, line breaks and comments. It may also shorten certain values when doing so is safe. Minification is different from compression such as gzip or Brotli: minification changes the text representation of the CSS, while transport compression reduces the bytes sent over the network. Keep an unminified source file for editing and debugging because minified CSS is harder for people to read. After minifying, test important pages to confirm that the stylesheet still behaves as expected, particularly when the original code contains unusual hacks, generated syntax or malformed rules. In a production workflow, minification is often automated during a build or deployment process rather than performed manually for every update.