Original: 0 chars | Minified: 0 chars
How it works
The HTML Minifier reduces HTML file size by removing all content that a browser ignores: whitespace between tags, HTML comments, optional closing tags, and redundant attribute quotes. The output is semantically identical to the input but smaller.
Reducing HTML payload size is a real performance optimization. Every kilobyte removed from a page's initial HTML reduces Time to First Byte (TTFB) and speeds up the browser's first parse. For high-traffic pages, even a 5% reduction in HTML size compounds across millions of requests.
How to use it: paste your HTML. The minifier removes whitespace between tags, strips HTML comments (<!-- ... -->), removes optional closing tags like </li>, </td>, </tr>, removes redundant quotes around attribute values where safe, and collapses boolean attributes (disabled="disabled" โ disabled).
What is NOT removed: content inside <pre>, <script>, and <style> tags is preserved as-is โ removing whitespace from inline JavaScript or CSS can break the code. The content of text nodes (visible text) is preserved. Required attribute quotes (values containing spaces or special characters) are kept.
Size reduction expectations: a typical HTML page with developer-formatted markup sees 10โ25% size reduction from minification alone. When combined with gzip compression (which web servers apply automatically), the combined reduction is typically 70โ85%.
Safe minification: unlike JavaScript minification (which can rename variables and reorder code), HTML minification only removes content the spec defines as insignificant. The rendered page is visually and functionally identical.
Frequently Asked Questions
- For production output, yes โ browsers ignore HTML comments entirely. The only case where comments should be preserved is IE conditional comments (<!--[if IE]>), which the minifier keeps.
- HTML5 allows certain closing tags to be omitted: </li>, </td>, </tr>, </th>, </tbody>, </thead>, </tfoot>, </colgroup>, </col>, </option>, </optgroup>. The browser infers these. Removing them safely reduces file size.
- If inline JavaScript relies on automatic semicolon insertion (ASI) and the minifier removes line breaks within a script block, it could theoretically break the code. This minifier preserves line breaks within script blocks.
- With caution. Email clients have quirky rendering requirements and often need specific whitespace patterns. Test minified HTML emails thoroughly in all target clients before sending.