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CSS Minifier

LOCAL · Browser-Only

Minify your CSS code to reduce file size and improve load times

Keep /*! */ comments

Input CSS

Minified Output

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What is CSS Minifier?

Free online CSS minifier to minify your CSS code and reduce file size for faster website load times.

This tool removes unnecessary whitespace, strips comments, and cleans up redundant formatting from your stylesheet while preserving its functionality. Smaller CSS files mean faster page loads, better Core Web Vitals scores, and reduced bandwidth usage. Paste raw CSS, compress it for production, and get an optimized version instantly with a clear before-and-after report of how much space you saved. Use it to minify CSS online before deploying, shrink a bloated stylesheet, or batch-clean exported framework CSS. Everything runs in your browser, so your code never leaves your device. No signup required.

How to Use CSS Minifier

1Paste your CSS code into the input area
2Click the 'Minify' button to compress your CSS
3Review the minified output and the size reduction stats
4Copy the minified CSS to use in your project

Frequently Asked Questions

What is CSS minification?

CSS minification is the process of removing unnecessary characters from CSS code - including whitespace, line breaks, comments, and redundant semicolons - without changing how it works. This reduces file size, which makes web pages load faster.

Will minification break my CSS?

No. Minification only removes characters that do not affect how browsers interpret your CSS. All your selectors, properties, values, and media queries remain intact. The minified CSS produces exactly the same visual result as the original.

How much space can CSS minification save?

Typical savings range from 10% to 30% depending on coding style. CSS with extensive comments, large indentation, and many line breaks will see the greatest reduction. The tool shows you the exact file size before and after minification.

Does minifying CSS upload my file to a server?

No. The CSS is processed entirely in your browser. Nothing is uploaded, so you can safely minify proprietary or client stylesheets without your code leaving your device.

Should I minify CSS before deploying to production?

Yes. Minified CSS loads faster and uses less bandwidth, which improves your Core Web Vitals and page speed scores. Keep an unminified copy in source control and minify as part of your build or before uploading to your host.

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