What does an HTML minifier do?

An HTML minifier reduces the size of an HTML file without changing how it renders. It removes unnecessary characters - HTML comments, line breaks, indentation, and repeated spaces between tags - so the browser downloads fewer bytes. The visible page looks exactly the same, but the file is lighter and loads faster.

Does minifying HTML change how my page looks?

No. Minification only removes characters that browsers ignore when rendering, such as comments and whitespace between tags. The structure, content, and styling stay identical. Whitespace inside tags where it matters - script, style, pre, and textarea - is preserved, so code blocks and preformatted text are unaffected.

Is my HTML uploaded to a server?

No. All minification happens entirely in your browser using JavaScript. Your HTML is never sent to or stored on a server, which makes the tool safe for private templates, internal pages, and unreleased markup.

Why should I minify HTML?

Smaller HTML files transfer faster, which improves page load time and Core Web Vitals - especially on mobile networks and high-traffic pages. Minified HTML also reduces bandwidth costs. Keep a readable, formatted version in your source code and minify as part of your build or before deploying static pages.

How much smaller will my HTML be?

It depends on how much whitespace and how many comments your markup contains. Heavily indented, well-commented HTML can shrink by 10-30%, while already-compact markup saves less. The tool shows the exact bytes saved and the percentage reduction so you can see the result for your specific file.

Does it minify inline CSS and JavaScript too?

This tool focuses on safe HTML minification and deliberately leaves the contents of script and style tags untouched to avoid breaking your code. To compress inline CSS or JavaScript, use a dedicated CSS or JavaScript minifier on those blocks. For JSON data, use the JSON Minifier & Formatter.

Will minifying remove my conditional comments?

No. Standard HTML comments are removed, but Internet Explorer conditional comments (those starting with <!--[if) are preserved because they can affect how legacy browsers load stylesheets or scripts.

Developer Tools

Popular

HTML Minifier

Free online HTML minifier. Compress and minify HTML by removing comments and collapsing whitespace - smaller files, faster page loads. Runs in your browser, no upload required.

HTML

Minified HTML

About HTML Minifier

Minify HTML instantly in your browser. Paste your markup to strip comments, collapse whitespace between tags, and trim blank lines - producing a smaller HTML file that downloads and renders faster. The minifier protects the contents of script, style, pre, and textarea tags so your code and preformatted text stay intact, and it shows exactly how many bytes you saved. Everything runs client-side, so your HTML never leaves your device.

How to Use HTML Minifier

Paste or type your HTML into the input box.
Click Minify HTML to remove comments and collapse extra whitespace.
Review the bytes saved and the percentage reduction shown above the output.
Click Copy to grab the minified HTML for your project or build pipeline.

HTML Minifier Examples

Collapse whitespace between tags

A multi-line list like <ul>\n <li>One</li>\n <li>Two</li>\n</ul> becomes <ul><li>One</li><li>Two</li></ul> - smaller and identical when rendered.

Remove comments

Developer comments such as  are stripped, while IE conditional comments (<!--[if IE]>) are preserved.

Protect scripts and styles

Whitespace inside <script>, <style>, <pre>, and <textarea> is left untouched so your code and preformatted content keep working.

Read the full guide

How to Use HTML Minifier: Complete Guide (2026) - 5 min read

Frequently Asked Questions about HTML Minifier

What does an HTML minifier do?: An HTML minifier reduces the size of an HTML file without changing how it renders. It removes unnecessary characters - HTML comments, line breaks, indentation, and repeated spaces between tags - so the browser downloads fewer bytes. The visible page looks exactly the same, but the file is lighter and loads faster.
Does minifying HTML change how my page looks?: No. Minification only removes characters that browsers ignore when rendering, such as comments and whitespace between tags. The structure, content, and styling stay identical. Whitespace inside tags where it matters - script, style, pre, and textarea - is preserved, so code blocks and preformatted text are unaffected.
Is my HTML uploaded to a server?: No. All minification happens entirely in your browser using JavaScript. Your HTML is never sent to or stored on a server, which makes the tool safe for private templates, internal pages, and unreleased markup.
Why should I minify HTML?: Smaller HTML files transfer faster, which improves page load time and Core Web Vitals - especially on mobile networks and high-traffic pages. Minified HTML also reduces bandwidth costs. Keep a readable, formatted version in your source code and minify as part of your build or before deploying static pages.
How much smaller will my HTML be?: It depends on how much whitespace and how many comments your markup contains. Heavily indented, well-commented HTML can shrink by 10-30%, while already-compact markup saves less. The tool shows the exact bytes saved and the percentage reduction so you can see the result for your specific file.
Does it minify inline CSS and JavaScript too?: This tool focuses on safe HTML minification and deliberately leaves the contents of script and style tags untouched to avoid breaking your code. To compress inline CSS or JavaScript, use a dedicated CSS or JavaScript minifier on those blocks. For JSON data, use the JSON Minifier & Formatter.
Will minifying remove my conditional comments?: No. Standard HTML comments are removed, but Internet Explorer conditional comments (those starting with <!--[if) are preserved because they can affect how legacy browsers load stylesheets or scripts.