HTML Minifier
Free online HTML minifier. Compress HTML code by removing whitespace, comments and optional tags. Reduce page size for faster loading. All processing is local and private.
How to Use HTML Minifier
Paste Your HTML
Paste HTML code into the input panel. The tool accepts any valid HTML — full documents, partial snippets, or template code with inline CSS and JavaScript.
Minify the Code
Click "Minify" to strip all unnecessary whitespace, line breaks, comments, and optional closing tags. The output is a compact single-line HTML string.
Copy the Result
The minified HTML appears in the output panel. Copy it to your clipboard or download as a .html file. Check the size reduction percentage to see how much bandwidth you save.
Example
Before (324 bytes)
<!DOCTYPE html>
<html>
<head>
<title>Page</title>
</head>
<body>
<h1>Hello</h1>
<p>Welcome to my site.</p>
</body>
</html>After (~150 bytes)
<!DOCTYPE html><html><head><title>Page</title></head><body><h1>Hello</h1><p>Welcome to my site.</p></body></html>Frequently Asked Questions
What does HTML minification remove?
HTML minification removes: leading/trailing whitespace, line breaks and indentation, HTML comments (<!-- -->), optional closing tags where the HTML spec allows them (like </li> and </p>), unnecessary quotes around attribute values, and empty attributes. It preserves: the structure and semantics of the document, essential whitespace between inline elements, and pre-formatted text inside <pre> and <textarea> tags.
Does minifying HTML affect SEO?
No. Search engines parse the DOM, not the raw HTML string. Minified HTML produces the same DOM as formatted HTML. Google explicitly recommends minifying HTML, CSS, and JavaScript as a performance best practice. The only SEO risk is if minification accidentally removes structured data (JSON-LD) or meta tags — our minifier preserves all content inside <script> and <meta> tags.
How much size reduction should I expect?
Typical savings: 10-30% for average HTML pages. The reduction comes almost entirely from whitespace and comments. Pages with heavy indentation and many comments see the largest savings. Pages that are mostly content with little nesting see smaller savings. HTML minification alone won't dramatically reduce page size — the biggest wins come from minifying CSS and JavaScript, compressing images, and enabling gzip/brotli compression on your server.
Should I minify HTML during development?
No. Keep your source HTML readable during development. Minify as part of your build/deploy pipeline — most static site generators (Astro, Next.js, Hugo) and bundlers (Webpack, Vite) handle this automatically for production builds. Use this tool for quick checks, one-off optimizations, or when you need to inline minified HTML into another file.
When to Minify HTML
HTML minification removes characters the browser doesn't need — whitespace, comments, optional tags. Combined with gzip compression (which your web server should already be doing), it reduces the bytes sent over the network. The savings from HTML minification alone are modest (10-30%), but they add up across millions of page views.
Best Practices
- Minify in your build pipeline, not during development
- Enable gzip/brotli compression on your server — this saves far more bandwidth than minification alone
- Combine HTML minification with CSS and JavaScript minification for maximum savings
- Always test minified output — aggressive minifiers can break inline JavaScript or CSS