CSS Minifier — Minify & Beautify CSS Online Free
DeveloperMinify CSS to reduce file size for production or beautify compressed CSS for editing. Shows exact percentage reduction. Free online CSS minifier — no sign-up.
About the CSS Minifier — Minify & Beautify CSS Online Free
Our free CSS minifier compresses your CSS code by removing comments, whitespace, line breaks and redundant semicolons — reducing file size and improving page load speed. We also offer a CSS beautifier that formats minified or messy CSS into clean, readable code with proper indentation. Minifying CSS is one of the easiest ways to improve your website's performance and Google PageSpeed score. Whether you are optimising stylesheets for production or cleaning up legacy CSS, this tool handles it instantly in your browser.
How to Use the CSS Minifier — Minify & Beautify CSS Online Free
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Paste your CSS code into the input box.
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Click Minify CSS to compress the code and remove all unnecessary whitespace and comments.
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Or click Beautify CSS to format compressed or messy CSS into readable, indented code.
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View the file size saving percentage shown above the output.
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Click Copy to copy the output, or download it as a .css file.
Frequently Asked Questions
What does minifying CSS actually do?
CSS minification removes all characters that are not required for the code to function — including whitespace, line breaks, comments, and the last semicolon before a closing brace. This reduces file size, which means faster download times and better website performance.
How much can CSS minification reduce file size?
Typically 20–40% depending on how much whitespace and comments the original file contains. Well-commented stylesheets with generous spacing can achieve even higher reductions.
Will minifying CSS break my website?
No. CSS minification only removes whitespace and comments — it does not change any selectors, properties or values. The minified CSS functions identically to the original.
What is the difference between minify and beautify?
Minify compresses CSS into a single line (or minimal lines) to reduce file size for production use. Beautify does the opposite — it takes compressed or messy CSS and formats it with proper indentation and line breaks for human readability.
Should I use minified CSS in production?
Yes. Always serve minified CSS in production environments. Keep your original unminified CSS as your development source file, then minify before deploying. Many build tools like Webpack, Vite and Parcel do this automatically.
Is there a file size limit?
There is no strict limit, but for very large stylesheets (over 1MB) processing may be slightly slower. The tool runs entirely in your browser so no data is sent to any server.