How much smaller will my CSS get?

Typically 15–30%, depending on comments and formatting.

Will it break my styles?

No — it removes only what browsers ignore.

Can I undo minification?

Use the CSS Beautifier to reformat, though comments are gone for good.

Does it support modern CSS?

Yes, including custom properties and modern selectors.

No, minification runs in your browser.

Should I minify during development?

No — minify only the production copy.

CSS Minifier

Strip whitespace and comments from CSS in one click.

Reading time:: 2 min
Last updated:: 5 August 2026
Price:: Free, no signup

Your text

Results (live)

Type or paste text to see the result.

What the CSS Minifier does

Paste your stylesheet and get it back compressed: comments gone, whitespace collapsed, trailing semicolons dropped. A 40 KB development stylesheet typically shrinks by a fifth or more.

The minifier understands CSS structure, so it won't merge rules in a way that changes what browsers do with them.

Why the CSS Minifier is useful

Every kilobyte of CSS is render-blocking — browsers won't paint the page until stylesheets arrive. Minifying is the cheapest speed win available, especially on mobile connections.

A quick browser-based minifier is handy when you don't have a build pipeline, or when you need to shrink a third-party file before uploading it somewhere.

Also known as: css minifier, css compressor, free css minifier, online css minifier, css minifier online free, css minifier tool, best css minifier tool.

How to use the CSS Minifier

1
Paste your CSS
The full stylesheet, comments and all.
2
Get the minified version
Compressed output appears with the size saving shown.
3
Deploy it
Copy or download and replace the original on your server.

Key features

Removes comments and unnecessary whitespace
Drops redundant semicolons
Shows byte savings
Structure-safe minification

Benefits

Faster first paint for your pages
Smaller files without a build tool
Keep the readable original, ship the minified copy

Real-life use cases

Speeding up a small site

A freelancer minifies the theme stylesheet before handing over a client site.

Shrinking a vendor file

A developer compresses a third-party CSS file that ships unminified.

Email template CSS

A marketer minifies inline-style blocks to keep the email under Gmail's clipping limit.

Tips for the best results

Always keep the unminified original as your editable source.
Minify after your final edit — minified CSS is painful to change.
Pair with the CSS Beautifier to go the other direction.

Conclusion

Smaller stylesheets, faster pages — paste, minify, deploy.

Frequently asked questions

How much smaller will my CSS get?: Typically 15–30%, depending on comments and formatting.
Will it break my styles?: No — it removes only what browsers ignore.
Can I undo minification?: Use the CSS Beautifier to reformat, though comments are gone for good.
Does it support modern CSS?: Yes, including custom properties and modern selectors.
Is my code uploaded?: No, minification runs in your browser.
Should I minify during development?: No — minify only the production copy.

Related tools you may need

JavaScript Minifier — Basic JavaScript minifier — strips comments and extra whitespace.
Border Radius Generator — Generate CSS border-radius shortcuts.
Box Shadow Generator — Generate CSS box-shadow with live preview.
CSS Gradient Generator — Generate ready-to-copy CSS linear gradients.
HTML Minifier — Strip whitespace and comments from HTML.
CSS Beautifier — Reformat compressed CSS with clean two-space indentation.
XML Validator — Check XML for well-formedness with the browser's DOM parser.
XML Formatter — Beautify XML with clean two-space indentation.

Keep exploring

Browse the full tools directory, filter by category, or read guides on the Text Tools Hub blog.