How CSS Minifier works
CSS Minifier transforms, validates or analyzes the data you provide according to the operation described on this page. The output should be reviewed before it is used in production code or security-sensitive workflows.
Compress and minify CSS code to reduce file size and optimize web performance.
Compress stylesheets for production and optimize page load speeds
.card{background-color:#ffffff;border-radius:12px;padding:24px;box-shadow:0 4px 6px -1px rgba(0,0,0,0.1)}.card h1{font-size:1.5rem;color:#111827;margin-bottom:8px}.card p{font-size:0.875rem;color:#6b7280;line-height:1.5}A fast client-side CSS compression tool. Strip unnecessary comments, extra whitespace, and redundant line breaks to reduce stylesheet sizes for web optimization.
Paste your raw CSS rules into the left editor pane.
View the minified CSS output instantly in the right editor pane.
Monitor real-time payload size savings and file reduction percentages.
Click 'Copy Output' to copy the compressed CSS directly to your clipboard.
Removes comments, unneeded whitespace, and trailing semicolons
Live byte size calculation with savings percentage display
Side-by-side comparison workspace
Browser-based processing — no server uploads
CSS Minifier transforms, validates or analyzes the data you provide according to the operation described on this page. The output should be reviewed before it is used in production code or security-sensitive workflows.
Generated or transformed output should be reviewed before deployment. Do not paste secrets, private keys, passwords or other sensitive credentials into a tool unless its privacy behavior explicitly supports that use.
This tool is designed to perform its main calculation or transformation in your browser. Do not enter information that the tool does not need, and review the site's Privacy Policy for analytics, advertising and third-party services.
Answers about how the tool works, its limitations, and how your information is handled.
Minification removes unneeded characters (comments, spaces, newlines) without changing CSS logic. This reduces HTTP transfer payload sizes and yields faster browser render speeds.
No. The minifier strictly removes formatting whitespace and comments while preserving all selectors, media queries, and declaration values.
No. All CSS minification scripts execute locally within your web browser.
This tool is designed to perform its main calculation or transformation in your browser. Do not enter information that the tool does not need, and review the site's Privacy Policy for analytics, advertising and third-party services.
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