CSS Minifier & Formatter
Minify CSS by stripping comments and collapsing whitespace, or beautify compressed CSS back into readable, indented rules. Both directions run in the browser on the text you paste, so it works for a snippet you inherited as much as for one you are shipping.
How it works
- 1
Paste the stylesheet or rule block you want to change.
- 2
Choose minify to strip comments and whitespace, or beautify to re-indent compressed CSS.
- 3
Compare the sizes to see what the formatting was costing.
- 4
Copy the result into your stylesheet, component or template.
What people use it for
- Compressing a style block before inlining it in a page head or an email.
- Reformatting a minified stylesheet you need to read or debug.
- Cleaning up CSS copied from a generator or a design tool export.
- Checking the size difference before deciding whether to add a build step.
Supported formats & options
| Input | CSS rules, whole stylesheets or fragments pasted as text |
|---|---|
| Minify removes | Comments, line breaks and redundant whitespace between selectors, properties and values |
| Beautify adds | Line breaks and indentation for each rule and declaration |
Key advantages & benefits
Both directions
Minify for delivery, or beautify a compressed file you need to read and edit.
Safer than minifying code
CSS has a simpler grammar than JavaScript, so removing comments and whitespace rarely changes behaviour.
No build step
Handy for an inline style block, an email template or a CMS field where a bundler is not involved.
Runs locally
Your stylesheet is processed in the tab and never uploaded.
Limits & things to know
- This tool does not merge duplicate selectors, shorten colour values, reorder declarations or remove unused rules — those are optimisations a dedicated CSS optimiser performs.
- Whitespace is significant inside content values, custom properties and some functional notations; check any rule with a content or var() declaration after minifying.
- Beautify restores structure, not the original formatting. Comments removed by a previous minification cannot be recovered.
Troubleshooting
A style stopped applying after minifying
Look for content values, custom properties or media query strings where a removed space mattered. Restore the space in that one declaration.
The file is still large after minifying
Most real CSS savings come from removing unused rules and from server compression. Enable gzip or Brotli, and audit for dead selectors, before optimising the syntax further.
Privacy & data handling
Your CSS is processed entirely in the browser tab and is never sent to our server.
CSS Minifier & Beautifier — Compress Stylesheets Online Free
Minify CSS online to cut stylesheet weight before deployment, or beautify compressed CSS back into readable, indented rules. This free CSS compressor removes comments, line breaks and redundant whitespace without ever altering how a single declaration renders.
- Minify CSS to reduce file size — typical hand-written stylesheets shrink noticeably, which directly improves Largest Contentful Paint because CSS is a render-blocking resource.
- CSS beautifier built in — paste a minified production stylesheet from a live site and re-indent it into structured, readable CSS for debugging or auditing.
- Safe by design — the compressor only removes comments and insignificant whitespace — selectors, specificity, cascade order and media queries come through equivalent.
- Better Core Web Vitals — smaller CSS means fewer bytes on the critical path, fewer render-blocking milliseconds and a measurably faster first paint on mobile connections.
- Runs entirely in your browser — proprietary design-system CSS and unreleased styles are processed locally with no upload, no account and no rate limit.
Use it alongside the JavaScript Minifier to compress your full front-end bundle, and the JSON Formatter for the config files that ship with it.
Frequently asked questions
Does minifying change CSS execution?
No! Minification only removes safe comments and whitespace without altering styling rules.
Will minifying break my stylesheet?
Rarely. CSS has a simple grammar, so removing comments and whitespace is usually safe. The exceptions are declarations where a space is meaningful — content values, custom properties and some functional notations — so check those specific rules after minifying.
How much smaller will my CSS get?
Typically 10-30 percent, depending on how much of the file is indentation and comments. That is worth having, but enabling gzip or Brotli on your server saves considerably more, and the two stack.
Can it remove unused CSS?
No. Finding unused rules requires analysing your HTML and JavaScript, which a text-level minifier cannot do. Use a purge tool wired into your build for that.
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