CSS Minifier & Formatter – Minify CSS Online Free
CSS Minifier is a free online tool that strips whitespace and comments from CSS to reduce file size, or reformats minified CSS for readability. Processing is live with a 300 ms debounce — paste your CSS and the output appears instantly. The stats bar shows the original size, output size, and percentage saved. Download the result or copy it to the clipboard. No data is sent to a server.
How to Minify CSS Online Free
- 01
Paste your CSS
Paste or type CSS into the input panel. The tool processes it automatically with a 300 ms debounce — no button press needed.
- 02
Choose a mode
Select "Minify" to strip whitespace and comments, or "Beautify" to add indentation and formatting. Switch modes at any time.
- 03
Copy or download
See the size reduction percentage in the stats bar. Copy the output to the clipboard or download it as a .css file.
Features
- ✓Minify: remove whitespace and comments
- ✓Beautify: add indentation and newlines
- ✓Live processing with 300 ms debounce
- ✓Size reduction stats (original → output → saved %)
- ✓One-click copy to clipboard
- ✓Download as .css or .min.css
- ✓100% client-side — no network requests
- ✓No login required
Frequently Asked Questions
What does CSS minification do?
CSS minification removes whitespace, line breaks, and comments from a stylesheet without changing its visual effect. The result is a smaller file that loads faster in the browser. Minified CSS is ideal for production deployments where file size matters.
What is CSS beautification?
CSS beautification (also called formatting or pretty-printing) adds proper indentation, newlines, and spacing to minified or poorly formatted CSS, making it easier to read and edit. This is useful when working with vendor-provided or build-tool-generated stylesheets.
Does minification affect how my CSS works?
No. The minifier only removes redundant whitespace and comments — it does not change selectors, property names, or values. The resulting stylesheet is functionally identical to the input and will produce the same visual output in browsers.
How much can CSS be reduced in size?
Typical reductions are 10–40%, depending on how much whitespace and how many comments the original file contains. A hand-written CSS file with generous spacing and inline documentation may see larger reductions than an already-compact file.
Can I download the minified CSS file?
Yes. After processing, click the "Download" button to save the output as a .css file. Minified output saves as "styles.min.css" and beautified output saves as "styles.css". You can also click "Copy" to copy the result directly to the clipboard.