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HTML Minifier & Compressor
HTML Minifier & Compressor shrinks a block of HTML by deleting comments and collapsing whitespace. It runs as a few string replacements inside your browser tab, so the markup you paste is never sent to a server. It is a quick, lightweight minifier for snippets and static pages rather than a full build-tool replacement.
How to use HTML Minifier & Compressor
- Paste your HTML source into the input box.
- Press Minify & Optimize Code.
- Copy the minified markup from the output panel and use it in your page or template.
Where HTML Minifier & Compressor is useful
- Trimming a static landing page or email-style snippet before pasting it into a CMS field with a size limit.
- Removing developer comments from markup before sharing it publicly.
- Checking roughly how much weight indentation and line breaks add to a hand-written template.
Formats, algorithms and limits
The tool applies four steps in order: it deletes every HTML comment (anything between <!-- and -->), collapses each run of spaces, tabs and line breaks into a single space, removes whitespace that sits between a closing > and the next <, and trims the ends. It does not minify the contents of <script> or <style> blocks, remove optional closing tags, or strip attribute quotes, so the result is smaller but not as aggressive as a build-time minifier.
Troubleshooting and honest limits
- Whitespace inside <pre> and <textarea> is collapsed too, so do not run markup through this tool if line breaks inside those elements matter.
- Removing the space between two inline elements (for example two links side by side) can make their text visually touch; add or a CSS margin if the gap was intentional.
- Inline JavaScript that relies on line breaks, such as a // comment followed by code, can break once newlines are collapsed. Keep scripts in external files or minify them separately.
- Conditional comments such as <!--[if IE]> are comments and will be removed.
Frequently asked questions
Does the HTML Minifier upload my code anywhere?
No. The minification is a handful of text replacements that run in your browser, so the markup stays on your device.
Will it minify my inline CSS and JavaScript?
No. Only the HTML itself is processed: comments are removed and whitespace is collapsed. The text inside <style> and <script> tags is treated as ordinary text, so its whitespace is collapsed but it is not properly minified. Use the CSS Minifier tool for stylesheets.
Is the minified output safe to use in production?
For simple, well-formed pages it usually is, but the tool is a text-based minifier, not an HTML parser. Always check the result in a browser, especially if the page has <pre> blocks, <textarea> elements or inline scripts.
How much smaller will my HTML get?
It depends on how much indentation and how many comments your source has. Heavily indented hand-written HTML often shrinks noticeably, while markup that is already compact changes very little. Servers that compress with gzip or Brotli remove much of the same redundancy anyway.
Related tools
Page written and reviewed by the FreeConvertio engineering team on 2026-10-31. HTML Minifier & Compressor runs entirely in your browser — no uploads, no account and no daily limits.