Developer Tool

CSS Minifier

Remove comments, whitespace, and optimize your CSS for production. Auto-minifies as you type.

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About This Tool

CSS Minifier

Minify your CSS files by removing whitespace, comments, and redundant code to reduce file size and speed up your website.

Why Use This Tool?

  • Reduce CSS file size to improve website loading speed and PageSpeed score
  • Remove comments and whitespace before pushing to production
  • Minify stylesheets for better Core Web Vitals and SEO performance
  • Used by web developers before deploying websites to live servers
  • Combine and minify multiple CSS snippets into a single optimized block

Overview

Every kilobyte of CSS your browser must download, parse, and apply adds to your page load time. While modern development workflows produce readable, well-commented stylesheets with generous whitespace, production websites should serve minified CSS that has all that extra content stripped out. Our CSS Minifier tool removes whitespace, comments, line breaks, and redundant characters from your CSS, reducing file size by 30–60% without changing a single style rule. Smaller CSS files mean faster downloads, quicker rendering, and better PageSpeed Insights scores — all of which directly impact your SEO rankings and user experience. This tool is essential for web developers preparing CSS for production deployment, and for webmasters who want to improve their Core Web Vitals scores. Paste your full CSS, click Minify, and get compact, optimised CSS in under a second. You can also use it in reverse — the Beautify function expands minified CSS back into readable format. All processing happens in your browser with no data transmitted to any server.

How to Use

  • 1

    Paste Your CSS

    Copy your CSS code from your editor or file and paste it into the input area on the left.

  • 2

    Click Minify

    Press the Minify button to instantly remove all whitespace, comments, and redundant characters.

  • 3

    Review the Output

    The minified CSS appears in the right panel. Check the file size reduction percentage shown.

  • 4

    Copy or Download

    Click Copy to copy the minified CSS to your clipboard, or Download to save it as a .css file.

  • 5

    Verify on Your Site

    Replace your original CSS with the minified version in your project and test that all styles still apply correctly.

Frequently Asked Questions

Yes. Minification only removes whitespace and comments — it does not change any CSS properties, values, or selectors. The resulting styles are identical.
Typically 30–60% reduction in file size depending on how much whitespace and comments the original file has. Well-documented files compress more.
Use both. Gzip compression happens at the server level. Minification reduces the size before Gzip, making Gzip even more effective. They complement each other.
Currently one at a time. To combine and minify, paste all your CSS files one after another in the input, then minify the combined result.
No. The minifier correctly handles all modern CSS features including custom properties (variables), @media queries, @keyframes, and pseudo-selectors.

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