Will minifying break my inline JavaScript or CSS?

Minification preserves meaningful whitespace inside strings, template literals, and regex. The optional inline JS and CSS minifiers also handle this. If you have unusual code like ASI-sensitive patterns, leave Minify Inline JS off and only collapse whitespace.

What does Remove Optional Tags actually remove?

Tags the HTML spec allows you to omit because the parser can infer them: closing before another , before a block element, , , even and open tags. Browsers parse the result identically, but some legacy tools may complain.

Does Gzip compression already handle this — is minifying redundant?

Gzip helps a lot, but minifying first usually gives another 5% to 10% on top because Gzip can't reorder content or remove redundant tokens. The combined size is what reaches the browser and what counts for Time to First Byte.

Will the minified HTML still validate against W3C standards?

With default options yes. Remove Optional Tags produces HTML that's still valid HTML5, since the spec explicitly allows omitting those tags. If you need strict XHTML compliance, keep that option off.

Can I undo minification to recover the original formatting?

Not perfectly. Whitespace, comments, and optional tags are gone for good once removed. The built-in Format button re-indents the markup so it's readable again, but it can't bring back the exact original layout or the comments you stripped. Keep your source file separately.

HTML Minifier

Minify HTML code to reduce file size

Original HTML

685 characters · 36 lines

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>My Page</title>
  <style>
    body {
      margin: 0;
      padding: 16px;
      font-family: sans-serif;
    }
    .container {
      max-width: 960px;
      margin: 0 auto;
    }
  </style>
</head>
<body>
  <!-- Main content area -->
  <div class="container">
    <h1>Hello, World!</h1>
    <p>
      This is a sample HTML page with
      extra whitespace, comments, and
      inline styles to demonstrate minification.
    </p>
  </div>

  <script>
    // Initialize the page
    document.addEventListener('DOMContentLoaded', function() {
      console.log('Page loaded');
    });
  </script>
</body>
</html>

Paste a direct link to an HTML page. Works with CORS-friendly servers.

Settings

Auto-minify

Presets

Collapse WhitespaceRemove CommentsRemove Optional TagsMinify Inline CSSMinify Inline JSCollapse Boolean AttributesRemove Redundant Types

What is HTML Minifier?

An HTML minifier removes unnecessary whitespace, comments, optional tags, and redundant attributes from HTML code. This reduces file size and improves page load time, which directly impacts Core Web Vitals scores and search rankings.

The minifier collapses runs of whitespace, drops HTML comments, optionally removes optional closing tags like </li> and </body>, and runs inline <style> and <script> blocks through CSS and JS minifiers. Output is functionally identical to the input but typically 20% to 40% smaller, which reduces Largest Contentful Paint times on mobile networks.

How to use

Step 1 — Paste your HTML source code into the input area.
Step 2 — Configure options: collapse whitespace, remove comments, remove optional tags, minify inline CSS/JS.
Step 3 — Copy the minified HTML or download it as a file. Check the size reduction percentage.

When to use

Server-rendered pages where you can't run a build-time minifier but want smaller HTML responses.
Email HTML templates where every kilobyte counts because clients clip messages over 102 KB.
Embedding HTML snippets in mobile apps or PDFs where bundle size translates directly to download time.

Result

Your 48 KB homepage HTML drops to 31 KB after minification — a 35% reduction that shaves 50ms off load time on 3G connections.

FAQ

Will minifying break my inline JavaScript or CSS?: Minification preserves meaningful whitespace inside strings, template literals, and regex. The optional inline JS and CSS minifiers also handle this. If you have unusual code like ASI-sensitive patterns, leave Minify Inline JS off and only collapse whitespace.
What does Remove Optional Tags actually remove?: Tags the HTML spec allows you to omit because the parser can infer them: closing </li> before another <li>, </p> before a block element, </tr>, </td>, even <html> and <body> open tags. Browsers parse the result identically, but some legacy tools may complain.
Does Gzip compression already handle this — is minifying redundant?: Gzip helps a lot, but minifying first usually gives another 5% to 10% on top because Gzip can't reorder content or remove redundant tokens. The combined size is what reaches the browser and what counts for Time to First Byte.
Will the minified HTML still validate against W3C standards?: With default options yes. Remove Optional Tags produces HTML that's still valid HTML5, since the spec explicitly allows omitting those tags. If you need strict XHTML compliance, keep that option off.
Can I undo minification to recover the original formatting?: Not perfectly. Whitespace, comments, and optional tags are gone for good once removed. The built-in Format button re-indents the markup so it's readable again, but it can't bring back the exact original layout or the comments you stripped. Keep your source file separately.

HTML Minifier

Original HTML

Settings

What is HTML Minifier?

How to use

When to use

Result

FAQ

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