CSS Minifier is designed for the exact search intent behind “css minifier”. Convert readable CSS into a more compact stylesheet by removing formatting that is not required by the CSS parser. Convert readable CSS into a more compact stylesheet by removing formatting that is not required by the CSS parser. What CSS minification removes Typical minification removes comments, indentation, line breaks and optional spaces around punctuation. Some optimizers also rewrite values, but that goes beyond whitespace-only minification. Minification vs optimization A minifier can reduce source size without deduplicating rules or redesigning selectors. Do not assume it performs dead-code elimination or full CSS optimization unless the tool explicitly says so. Test the result Custom properties, calc expressions, strings and unusual syntax should remain intact. Validate the final stylesheet in the browsers you support. Worked example: A formatted rule such as `.card { color: red; margin: 0 10px; }` can be represented more compactly without changing those declarations. Common practical uses include Shrink stylesheet source; Prepare CSS for deployment; Compact code pasted into embeds; Compare formatted and minified CSS. Important limitations: Minification does not remove unused selectors unless specifically implemented. Malformed CSS can produce unreliable output. Transfer compression can further reduce delivered bytes. Key questions this page should answer include: What does a CSS minifier do? It removes unnecessary formatting such as comments, line breaks and optional whitespace to reduce source size. Does minifying CSS change styles? Safe minification should preserve CSS behavior, but production output should still be tested. Does CSS minification remove unused CSS? Not normally. Removing unused rules requires usage analysis or a dedicated purge process. Is minification the same as compression? People often use the terms loosely, but minification rewrites source while gzip/Brotli compress data for transfer. Can I format minified CSS again? A formatter can restore readable layout, though it cannot recreate removed comments or the exact original formatting. The page should stay focused on this differentiator: Separate safe minification from dead-code removal and network compression.
How to use this tool
What CSS minification removes
Typical minification removes comments, indentation, line breaks and optional spaces around punctuation. Some optimizers also rewrite values, but that goes beyond whitespace-only minification.
Minification vs optimization
A minifier can reduce source size without deduplicating rules or redesigning selectors. Do not assume it performs dead-code elimination or full CSS optimization unless the tool explicitly says so.
Test the result
Custom properties, calc expressions, strings and unusual syntax should remain intact. Validate the final stylesheet in the browsers you support.
Examples
Compact a declaration
A formatted rule such as `.card { color: red; margin: 0 10px; }` can be represented more compactly without changing those declarations.
Common use cases
- Shrink stylesheet source
- Prepare CSS for deployment
- Compact code pasted into embeds
- Compare formatted and minified CSS
Frequently asked questions
What does a CSS minifier do?
It removes unnecessary formatting such as comments, line breaks and optional whitespace to reduce source size.
Does minifying CSS change styles?
Safe minification should preserve CSS behavior, but production output should still be tested.
Does CSS minification remove unused CSS?
Not normally. Removing unused rules requires usage analysis or a dedicated purge process.
Is minification the same as compression?
People often use the terms loosely, but minification rewrites source while gzip/Brotli compress data for transfer.
Can I format minified CSS again?
A formatter can restore readable layout, though it cannot recreate removed comments or the exact original formatting.