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HTML Minifier
The HTML Minifier reduces the size of HTML documents by safely removing whitespace, comments, and optional attributes without altering how browsers render the page. Smaller HTML means faster Time to First Byte (TTFB), quicker parsing, and lower bandwidth consumption. Use it alongside the CSS and JavaScript minifiers to optimize every resource in your front-end stack.
What is HTML minification?
HTML minification removes all characters from an HTML file that the browser does not need to render the page correctly. This includes indentation whitespace, line breaks between tags, HTML comments (<!-- -->), the optional closing tags that the HTML5 spec allows to be omitted (such as </li> and </td>), redundant attribute quotes where the value contains no whitespace, and boolean attributes written as attribute='true' that can be reduced to just the attribute name. On a typical HTML page, minification reduces size by 10–30%, with larger gains on heavily templated pages with many comments and formatting.
How does the minifier work?
The tool parses the HTML into a token stream of tags, text nodes, comments, and script/style blocks. Comments are removed unless they are conditional comments (<!--[if IE]>). Whitespace between block-level elements is collapsed to a single space or removed entirely. Inline elements (span, a, em) are handled carefully to avoid introducing or removing visible spaces between words. Embedded <style> blocks are passed through the CSS minifier and <script> blocks through the JavaScript minifier. Attribute values are unquoted where safe to do so according to the HTML5 specification.
Typical Use Cases
- Reducing the payload of HTML documents served to millions of users to cut bandwidth costs
- Shrinking inline HTML in email templates for faster delivery and rendering
- Preparing static site output for production deployment
- Benchmarking the uncompressed and minified sizes of a page during performance audits
Step-by-step Guide
- Step 1: Paste your HTML code into the input area.
- Step 2: Configure options such as removing comments or collapsing whitespace.
- Step 3: Click 'Minify' to generate the compressed output.
- Step 4: Copy or download the minified HTML for use in production.
Example
Input
<!-- header --> <header> <h1>Hello</h1> </header>
Output
<header><h1>Hello</h1></header>
Tips & Notes
- Always test the minified output in multiple browsers before deploying, especially if optional tag removal is enabled.
- Do not minify HTML in development – keep formatted source for readability and use source maps for debugging.
- Pair HTML minification with gzip or Brotli server-side compression for the greatest total reduction in transfer size.
Frequently Asked Questions
Can HTML minification break my page?
Safe options (removing comments and collapsing whitespace) are very unlikely to break anything. Aggressive options like removing optional closing tags can cause issues in rare edge cases with malformed HTML or legacy parsers. Always test after minifying.
Are conditional comments preserved?
Yes. Conditional comments (<!--[if IE]> ... <![endif]-->) are preserved because they affect rendering in older Internet Explorer versions and removing them would change behavior.
Does the minifier process inline CSS and JS?
Yes. CSS inside <style> tags and JavaScript inside <script> tags are minified using the respective CSS and JS minification algorithms.
HTML Minifier
Minify HTML code by removing unnecessary whitespace, comments, and line breaks.
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