HTML Minifier
Minify HTML code by removing comments and whitespace
Preserves preformatted text. Choose Safe, Recommended or Aggressive to control the original minification rules.
Processed on this device. Your text is not uploaded.
Compression results
- Original size
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- Minified size
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- Bytes saved
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- Reduction
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About HTML Minifier
The HTML Minifier is a free online tool that reduces the file size of your HTML code by removing unnecessary characters without changing its functionality. HTML minification strips out whitespace, comments, empty attributes, and optional closing tags, resulting in smaller files that load faster and consume less bandwidth.
Minified HTML loads faster because browsers need to download less data. For high-traffic websites, even small reductions in file size can significantly reduce bandwidth costs and improve user experience. Studies show that minification can reduce HTML file sizes by 10-30%, directly impacting page load times and Core Web Vitals metrics.
Our tool offers three minification levels: Safe (basic whitespace compression only), Recommended (removes comments, whitespace, and empty attributes while minifying inline CSS & JS), and Aggressive (maximum compression including removal of optional HTML5 closing tags). Real-time compression statistics show you exactly how much space you saved.
Key Features
- Three minification presets: Safe, Recommended, and Aggressive compression levels
- Real-time minification that processes your HTML as you type or paste
- HTML comment removal to strip development notes from production code
- Whitespace collapsing that removes extra spaces, tabs, and empty lines between tags
- Empty attribute removal for attributes with no values (e.g., class="")
- Optional HTML5 closing tag removal for elements like li, p, td, and option
- Inline CSS minification within style tags (comment removal, whitespace collapsing)
- Inline JavaScript minification within script tags (comment lines, indentation and blank lines removed) and compacted JSON-LD blocks
- Compression statistics showing original size, minified size, savings in bytes, and percentage reduction
- One-click copy to clipboard and download as minified .html file
How to Use the HTML Minifier
- Choose a minification level: Select Safe for basic compression, Recommended for balanced optimization (default), or Aggressive for maximum file size reduction.
- Paste your HTML: Enter or paste your HTML code into the input textarea on the left side, or click "Load Sample" to try the tool with example code.
- Review the output: The minified HTML appears instantly in the output panel on the right, with real-time compression statistics showing your savings.
- Check the results: Review the compression results card showing the percentage reduction, original size, and minified size.
- Copy or download: Click "Copy" to copy the minified code to your clipboard, or "Download" to save it as a minified.html file.
Use Cases
- Production deployment: Minify HTML templates and pages before deploying to production servers for faster page delivery.
- Email template optimization: Reduce the size of HTML email templates to improve delivery speeds and avoid size-related filtering by email providers.
- Performance optimization: Improve Core Web Vitals scores, especially Largest Contentful Paint (LCP), by reducing the time needed to download and parse HTML.
- Bandwidth reduction: Lower hosting and CDN costs by serving smaller HTML files, particularly important for high-traffic websites.
- Mobile optimization: Ensure fast loading on mobile networks where every kilobyte matters, especially for users on slow cellular connections.
- Static site generation: Post-process static site generator output to minify all HTML files before publishing to your hosting platform.
- SEO improvement: Boost page speed, which is a confirmed Google ranking factor, by serving minified HTML alongside compressed assets.
- Ad landing pages: Minimize HTML on landing pages where every millisecond of load time directly impacts conversion rates.
Frequently Asked Questions
Will minification break my HTML?
The Safe and Recommended presets are very conservative and should not break any valid HTML. The Aggressive preset removes optional closing tags, which is valid per the HTML5 specification but may cause issues with some older parsers or strict validation tools. Always test the minified output before deploying to production.
What is the difference between the three minification levels?
Safe mode only collapses whitespace. Recommended mode adds comment removal, empty attribute removal, and inline CSS/JS minification. Aggressive mode includes everything in Recommended plus removal of optional closing tags like </li>, </p>, and </td> for maximum compression.
Should I minify HTML if I already use gzip compression?
Yes. Minification and gzip/brotli compression work together. Minification removes redundant characters from the source code, while gzip compresses the remaining content during transfer. Combining both provides the best results, as minified HTML compresses even more efficiently.
Does minification affect inline scripts and styles?
When using the Recommended or Aggressive presets, the tool will minify inline CSS within style tags and inline JavaScript within script tags. External script and style references (using src or href attributes) are left unchanged.
Tips & Best Practices
- Start with Recommended: The Recommended preset offers the best balance between compression and safety. Use it as your default and only switch to Aggressive if you need maximum savings.
- Always test the output: After minifying, verify that your page renders correctly in all target browsers before deploying to production.
- Combine with other optimizations: For best results, use HTML minification alongside CSS/JS minification, image compression, and server-side gzip or brotli compression.
- Keep source files unminified: Always maintain your original, readable HTML source files for development. Minify only the production output.
- Automate in your build process: For ongoing projects, integrate HTML minification into your build pipeline or CI/CD process rather than minifying manually each time.
- Monitor the savings: Use the compression statistics to track how much space you are saving. If savings are minimal, focus your optimization efforts on larger assets like images and scripts.