HTML Minifier
Minify HTML fragments or documents locally while preserving script, style, pre, and textarea content.
Open toolCSS Minifier
Minify a CSS stylesheet online and compare its source and output byte counts. Choose license-comment handling, then copy or download the compact CSS; rule restructuring is disabled.
Free to useNo sign-upRuns in your browser
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Enter the inputs, then select Minify CSS.
Your result
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Result will appear here
How CSS Minifier works
The minifier checks strings and bracket balance, then compacts parsed CSS with rule restructuring disabled and the selected comment policy.
The result reports UTF-8 byte totals and supplies the CSS text for copy or download. Test the output with the actual stylesheet before replacing a deployed file.
Unfinished strings, comments, or unmatched brackets can stop processing.
How to use CSS Minifier
Paste CSS source and choose whether license style comments should remain.
Set CSS and comment policy
Paste the stylesheet and choose whether /*! license comments should remain. Close strings, comments, and brackets in the source before processing, and retain the original for comparison.
CSS
Minify the representation
Run the minifier and inspect the output byte total with original bytes and bytes saved. The result text keeps rule order because restructuring is disabled.
66 bytes
Copy or download and test
Copy the text or download minified.css, then review the real stylesheet rendering. Read the quoted-content and disabled-restructuring note. Byte reduction does not replace a check of the intended cascade.
Output and export
When to use CSS Minifier
Minify a stylesheet copy while retaining a readable source for future edits.
Prepare a stylesheet copy
Create a compact version of a reviewed stylesheet for a build or static asset workflow. Continue editing the readable source instead of the minified file. Check that any links to fonts and images still resolve from the final asset location.
Measure CSS source reduction
Compare the reported UTF-8 source bytes before and after minification for this input. Use those numbers for the stylesheet transformation only. Browser caching, transport compression, other assets, and rendering behavior are separate parts of an actual page performance assessment.
Check a third party excerpt
Process a CSS excerpt when evaluating how its comments and syntax are handled. Preserve required attribution where appropriate and test the resulting rules in context. Successful minification does not establish that an unfamiliar stylesheet is compatible with your component.
Review CSS minification and optimization limits
Review the compact stylesheet and retained comments before substituting it in a page.
The minifier does not use rule restructuring in this configuration. Strings and references remain source content; imports and URLs are not fetched or checked for availability.
A compact stylesheet is not a compatibility report. Its appearance and effect still depend on the browser, document, cascade, and other styles applied to the same elements.
Check syntax and unexpected output
Resolve unfinished source syntax and test the resulting stylesheet with its actual imports and referenced assets.
Unfinished strings, comments, or unmatched brackets can stop processing. Check the original around the reported area and use complete rules rather than a cut off clipboard excerpt.
Input is bounded at 100000 characters and processing has a time budget. If an application behaves differently with the output, compare the original rules and test the actual styled elements.
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Open toolMinify and download a CSS stylesheet
Paste CSS source and choose whether license style comments should remain.
CSS Minifier: common questions
Answers about using CSS Minifier and understanding its results.
Are quoted strings stripped?
No. String contents are parsed as strings rather than removed as comments.
Does it combine or reorder rules?
Rule restructuring is disabled.
Can I keep license comments?
Yes. Choose the option to keep comments beginning with /*!; the other mode removes comments.
Does it fetch imported stylesheets?
No. Imports and URLs remain references in the CSS source. The output does not include the contents of those external resources.