HTML Minifier

Step-by-step guide

1. 1
   Paste your HTML source
   Copy your raw HTML: a full page, a template partial, or an email template: and paste it into the input panel.
2. 2
   Choose minification options
   Select which optimisations to apply: collapse whitespace, remove comments, remove optional closing tags, or inline CSS/JS minification.
3. 3
   Click Minify
   The tool processes your HTML instantly in the browser and outputs the compressed version with a byte-savings summary.
4. 4
   Review the size reduction
   Check the before/after byte counts and percentage saved to confirm the output meets your performance targets.
5. 5
   Copy and deploy
   Copy the minified HTML and replace the original in your build pipeline, CDN, or server response.

Frequently Asked Questions

What does an HTML minifier do?

An HTML minifier removes characters from HTML source code that are not required for the browser to parse and render the page correctly. This includes whitespace between tags, HTML comments, optional end tags, and redundant attribute quotes. The result is a smaller file that transfers faster over the network.

How much can minification reduce my HTML file size?

Typical HTML files see a 10–30% reduction in raw bytes. Files with verbose comments, heavy indentation, or inline styles and scripts can see reductions of 40% or more. The savings stack with gzip/Brotli compression applied by your web server.

Is it safe to remove HTML comments?

In almost all cases yes. HTML comments are ignored by the browser at render time. The only exception is Internet Explorer conditional comments (<!--[if IE]>), which this tool preserves when that option is selected.

Does minified HTML affect SEO?

No. Search engine crawlers parse the DOM, not raw HTML bytes. Minification does not change the semantic structure of your page, so rankings are unaffected. In fact, faster page load times from smaller HTML can indirectly improve Core Web Vitals scores.

Can I minify inline CSS and JavaScript inside my HTML?

Yes. When the inline script/style option is enabled, content inside style and script tags is also compressed using the same whitespace-collapsing rules applied to the HTML itself.

Will minified HTML break my page layout?

It should not. Minification only removes characters that are semantically irrelevant to the browser renderer. If you notice layout issues, the most common cause is whitespace between inline-block or inline-flex elements: you can disable whitespace collapsing for those cases.

Does my HTML get sent to a server?

No. All processing runs entirely in your browser. Your source code is never transmitted anywhere, making it safe to use with proprietary templates or internal tooling.

Should I minify HTML in development or production?

Minify only for production builds. Working with minified HTML during development makes debugging significantly harder. Modern build tools like webpack, Vite, and Next.js can be configured to minify HTML automatically at build time.

How does HTML minification compare to gzip?

They are complementary, not alternatives. Minification reduces the raw byte count before compression. Gzip or Brotli then further compresses the already-minified output. Applying both gives the best results for Time to First Byte (TTFB).