Quick answer

How to use the free CSS/HTML Minifier

To minify CSS or HTML for free, paste your code, and see the minified output instantly with original size, minified size, and percentage saved. Strips whitespace and comments locally.

Minify mode

Removes comments and whitespace, strips spaces around braces, colons, and semicolons, and drops the optional final semicolon. Content inside url() is preserved.

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Questions

Frequently asked questions

What does minification do?

Minification removes characters that aren't required for execution — comments, line breaks, indentation, and redundant whitespace — without changing what the code does. The result is byte-for-byte smaller and faster to download.

Is minified CSS or HTML still valid?

Yes. The tool only strips whitespace, comments, and optional trailing semicolons in CSS. Selectors, property values, attribute values, and tag content are preserved exactly. Both browsers and validators accept the output as-is.

What does the HTML minifier protect?

It preserves content inside <pre>, <textarea>, <script>, and <style> tags verbatim — whitespace matters there. It also keeps IE conditional comments (the <!--[if IE]>…<![endif]--> blocks) untouched.

Will the output ever be larger than the input?

No. The minifier guarantees the output byte length is always less than or equal to the input. If a transformation would somehow grow the source (it shouldn't with normal input), the tool falls back to the original.

Is my code sent to a server?

No. Everything runs locally in your browser using plain JavaScript string processing. Your CSS or HTML never leaves your device.

Free CSS & HTML minifier

Minify CSS and HTML to reduce file size — see exactly how many bytes and what percentage you saved. Strips whitespace, comments and redundant characters while keeping the code valid. Everything runs in your browser: your source code is never uploaded. Perfect for production deployment and faster page loads.

How to minify CSS or HTML

  • Paste your CSS or HTML into the input.
  • The minified output appears instantly in the preview.
  • See the original size, minified size and percentage saved.
  • Copy the minified result.

Why minify for production

Every byte of whitespace, comment and optional semicolon adds up. Minifying CSS and HTML before deployment cuts file sizes by 15–30% on CSS and even more on HTML-heavy pages. Smaller files load faster, improve Core Web Vitals, and reduce bandwidth costs — all with zero effect on how the page looks or works.

What gets removed

  • Whitespace, tabs and line breaks.
  • Comments (both CSS /* */ and HTML <!-- -->).
  • Unnecessary semicolons and trailing commas in CSS.
  • Redundant quotes around unquoted attribute values in HTML.

Frequently asked questions

Will minification break my code? No — the ToolCrix CSS & HTML minifier removes only whitespace and comments; selectors, rules and markup logic are untouched.

How much smaller will my files get? Typically 15–30% for CSS; HTML savings vary with content density. The ToolCrix minifier shows exact bytes and percentage saved.

Does the minifier handle JavaScript? The ToolCrix minifier focuses on CSS and HTML — for JS, use your build tool's minifier (Terser, esbuild) which can safely rename variables.

Is my source code uploaded? No — the ToolCrix CSS & HTML minifier processes everything locally in your browser, so proprietary stylesheets and templates stay private.

GuideCSS & HTML Minifier: Compress Code for Faster WebsitesRead the full guide →

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