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CSS Minifier
Compress your CSS code by removing whitespace, comments, and redundant rules.
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What is CSS Minifier?
A CSS Minifier is a tool that reduces the size of your CSS code by removing unnecessary characters without changing its functionality. The minification process removes whitespace, comments, redundant selectors, and optimizes property values to create a smaller, more efficient stylesheet.
Smaller CSS files load faster, consume less bandwidth, and improve your website's performance metrics like LCP (Largest Contentful Paint) and FCP (First Contentful Paint). Combined with Gzip compression, CSS minification is a best practice for any production website.
How to Use This CSS Minifier
- Paste your CSS code into the input textarea above.
- Customize the minification options using the checkboxes (remove comments, merge rules, etc.).
- Click "Minify CSS" to compress your code.
- Copy the minified output using the copy button.
Frequently Asked Questions
Does CSS minification affect my website's appearance?
No. CSS minification only removes unnecessary characters and optimizes the code structure. The rendered output in the browser remains identical. Advanced optimizations like restructuring and semantic merging are designed to be safe and preserve functionality.
Is my CSS code stored on a server?
No. All processing happens entirely in your browser using the clean-css library. Your CSS code never leaves your device.
What optimization level should I use?
Level 0 is useful if you only want basic cleanup. Level 1 applies safe optimizations like removing comments and normalizing values. Level 2 (default) applies advanced optimizations including merging adjacent rules and restructuring for maximum compression.
Last updated: 17 Aug 2026
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