Free CSS minifier online — compress CSS code to reduce file size and improve website loading speed. No signup required.
Minify CSS code to reduce file size and improve website performance. Remove whitespace, comments, and unnecessary characters. Works 100% in your browser.
CSS Input
Minified CSS
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Original Size
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Minified Size
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Savings
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Bytes Saved
Copied!
Legal Disclaimer / Yasal Uyarı: This tool processes all data locally in your browser. No CSS code is sent to any server. / Bu araç tüm verileri tarayıcınızda yerel olarak işler. Hiçbir CSS kodu sunucuya gönderilmez.
What the CSS Minifier Does and Why It Matters
The CSS Minifier shrinks stylesheets by removing comments, unnecessary whitespace, and redundant characters while preserving exactly how the styles render. The output is a single compact block of CSS.
Smaller CSS means fewer bytes for the browser to download and parse, which improves load time and Core Web Vitals. Minifying is a standard production step, and doing it here is quick when you just need a compressed version of a stylesheet.
How to Use CSS Minifier
Paste your CSS into the input area.
Run the minifier.
Review the compact output and the size reduction.
Copy the minified CSS.
Drop it into your production build or a <style> block.
Keep your original, readable source for future edits.
Supported Inputs and Limitations
Supported input
Standard CSS stylesheets
CSS with comments and formatting to strip
What you get
Minified, single-line CSS
A smaller file ready for production
Copy-ready compressed output
Known limitations
Minification removes comments, so keep an unminified source for maintenance.
It does not remove unused selectors; that requires a separate tree-shaking step.
Non-standard or invalid CSS may not minify cleanly until corrected.
Privacy and Security
Minification runs locally in your browser; your stylesheet is never uploaded to NovaTools and nothing is stored after you leave. Proprietary CSS stays on your device.
Frequently Asked Questions
Does minifying change how my styles look?
No. It only removes characters that do not affect rendering, such as comments and whitespace. The visual result is identical to the original CSS.
Will it remove CSS rules I am not using?
No. Minification compresses the code you provide but does not detect unused selectors. Removing dead CSS requires a dedicated purge/tree-shaking tool.
Should I keep my original CSS?
Yes. Always maintain the readable source and minify as a build step, because minified CSS is hard to edit by hand.
CSS minification is the process of removing unnecessary characters from CSS code without changing its functionality. This includes removing whitespace, comments, and unnecessary semicolons. Minified CSS loads faster, reducing page load times and improving user experience. This free online tool helps you compress your CSS for production use.
Use Copy to copy the minified CSS or Download .css to save as a file.
Minification Features
Removes CSS comments (/* ... */)
Removes unnecessary whitespace and line breaks
Removes last semicolons in rule blocks
Combines multiple spaces into single spaces
Removes zero units (0px → 0)
Preserves CSS functionality and selectors
Frequently Asked Questions
Why should I minify my CSS?
Minified CSS files are smaller and load faster, improving your website's performance. Smaller files mean less bandwidth usage for both you and your users, and faster page rendering in browsers.
Is my CSS code kept private?
Yes, completely. All minification happens locally in your browser using JavaScript. No CSS code is ever transmitted to any server or stored anywhere.
Will minification break my CSS?
No, proper minification only removes unnecessary characters without changing the functionality. However, we recommend testing your minified CSS on a staging environment before deploying to production.
How much size reduction can I expect?
Size reduction varies depending on your CSS. Typically, you can expect 10-30% reduction for well-formatted CSS with comments, and up to 50% or more for CSS with extensive comments and whitespace.
Should I keep the original CSS file?
Yes, always keep your original, unminified CSS file for development and debugging. Use the minified version only for production deployment. Consider using a build process that generates minified files automatically.
Recommended next reading
Use these practical guides to understand when this tool is the right choice, what to check before exporting, and which workflow usually comes next.
