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CSS Minifier— Free & Private

Minify CSS code by removing whitespace, comments, and redundant syntax — all in your browser.

Processed in your browser. Nothing uploaded.

What Is CSS Minification?

CSS minification removes all unnecessary characters from CSS code — including whitespace, comments, and redundant semicolons — without changing how the stylesheet behaves. Minified CSS files are significantly smaller, leading to faster page load times and reduced bandwidth usage. Our minifier processes your stylesheets entirely in the browser, so proprietary CSS and design systems are never exposed to third-party servers.

How to Use CSS Minifier

  1. Paste your CSS

    Paste your CSS code into the input area or upload a .css file from your device.

  2. Minify

    Click the Minify button to strip whitespace, comments, and redundant code.

  3. Copy or download

    Copy the minified CSS to your clipboard or download it as a file.

Why Use Our CSS Minifier?

Runs entirely in your browser — no CSS uploaded to any server
Reduces file size by removing whitespace, comments, and unnecessary code
Improves page load speed and Core Web Vitals scores
Preserves all CSS functionality and selector specificity
Handles large stylesheets and complex selectors
Shows file size savings after minification
No installation or build tools required

Frequently Asked Questions

How much smaller will my CSS file be after minification?

Typical reductions range from 20% to 50%, depending on how much whitespace and how many comments your original file contains. Files with extensive developer comments see the largest reductions.

Will minification break my CSS?

No. Minification only removes characters that have no effect on how the browser interprets the stylesheet. All selectors, properties, values, and media queries remain functionally identical.

Should I minify CSS for production websites?

Yes. Minification is a standard best practice for production deployments. Smaller CSS files download faster, improving page load times and user experience. Keep unminified source files for development and debugging.