HTML Minifier – Minify & Compress HTML

HTML Minifier – Compress HTML Code and See Exactly How Much You Save

HTML written by people is full of things browsers do not need: indentation, blank lines, comments, notes to your future self. All of it is downloaded with every page view. An HTML minifier strips that extra weight so the file is smaller while the page is meant to look and behave the same.

This HTML minifier online lets you paste your code, choose which clean-ups to apply, and see the original size, the minified size and the percentage saved right away. You can then copy the result or download it as a file. It is useful for small static pages, email-style templates, landing pages and snippets where a build tool would be overkill.

How to Minify HTML Code

1. Paste your HTML into the left panel, or click Sample to see how it works.
2. Choose your options. The checkboxes above the editor control what is removed.
3. Read the result. The right panel shows the minified code, and the cards on top show original size, minified size, bytes saved and reduction. A Before vs After bar appears below.
4. Copy or download. Use Copy Output, or Download to save minified.html.
5. Test the page. Open the minified version in a browser before you publish it.

The output updates automatically a moment after you stop typing or change an option. The Swap button moves the output into the input box if you want to run it through again.

What Each Option Does

• Remove Whitespace – collapses spaces and line breaks, including the gaps between tags. This brings most of the savings.
• Remove Comments – deletes HTML comments. Internet Explorer conditional comments are left alone.
• Remove Empty Attrs – removes attributes with nothing in them, such as class="".
• Remove Attr Quotes – drops the quotation marks around simple attribute values that contain no spaces or special characters.
• Minify Inline CSS – shrinks the contents of <style> blocks. For a full stylesheet use the CSS Minifier, which has more controls.
• Minify Inline JS – does a light clean-up of <script> blocks. Script blocks that are not JavaScript, such as JSON data, are skipped.
• Lowercase Tags – off by default. Turns tags that start with a capital letter into lowercase.

Why Minify HTML?

• Smaller downloads. Less to transfer means a faster first load, especially on slow mobile connections.
• Less clutter in production. Developer comments are not shipped to visitors.
• Works alongside server compression. If your host already compresses files with gzip, minifying still helps because there is less data to compress to begin with.
• Quick checks. The savings figures show immediately how much of a file was just whitespace and comments.

How much you save depends entirely on your file. Heavily indented code with lots of comments shrinks the most; already compact markup shrinks very little.

Where HTML Minification Can Go Wrong

Minifiers work on text, so a few spots need care. Always compare the result with the original.

• Spaces between inline elements. Whitespace between tags is removed. If your page relies on a space between two inline tags, such as two links next to each other, the words can end up joined.
• Preformatted text. Content inside <pre> and <textarea> depends on its spacing. The whitespace option does not treat those blocks specially, so avoid it on pages where that spacing matters.
• Inline JavaScript. The script clean-up is basic. It removes comments and line breaks with simple text rules, which can interfere with code that contains // inside a string, such as a web address, or code that depends on line breaks instead of semicolons. Attribute-quote and empty-attribute removal are applied to the whole document, scripts included, so turn those two options off if your page has inline JavaScript. For scripts that matter, minify them separately with a dedicated tool.
• Lowercase Tags. This lowercases the whole tag, including attribute values like class names and links. Leave it off unless that is acceptable.
• It is not a validator. The tool does not repair broken markup or check it against standards.

Keep your original, readable file as the source and treat the minified copy as the version you upload.

Handy Checks Before You Publish

• Search engine titles and descriptions have length limits. The Character Counter includes Meta Title and Meta Desc presets so you can check your tags.
• If your markup contains links with special characters, the URL Encoder/Decoder helps you encode them correctly.
• Structured data in a JSON block is easier to review after running it through the JSON Formatter.
• Pages with inline images stored as text can be inspected with the Base64 Encoder/Decoder.
• Need to match a color from an inline style? The Color Code Converter converts between color formats.

Privacy

Your code is processed in your browser. The tool does not send it to a server.

Frequently Asked Questions About the HTML Minifier

What does an HTML minifier do?

It removes characters browsers do not need, mainly extra whitespace and comments, so the file is smaller. The page is meant to render the same.

Will minifying break my page?

Usually not, but it can in the cases listed above, such as preformatted text or inline scripts. Test the minified file in a browser before publishing.

How much smaller will my HTML get?

It depends on how much whitespace and how many comments your file has. The tool shows the exact bytes saved for your code.

Can I minify CSS and JavaScript inside my HTML?

Yes. Inline CSS and inline JS options handle the blocks inside your page. For full stylesheets, the CSS Minifier gives more control, and larger scripts are better handled by a dedicated JavaScript tool.

Do I still need gzip if I minify?

They work together. Minification reduces the file itself, and server compression shrinks what is sent over the network.

Can I get my original code back?

Not from the minified text, because removed comments and spacing are gone. Keep your original file.

Is this HTML compressor free and private?

Yes. It is free, has no sign-up, and your code stays in your browser.

Reviewed by Kromo Tools Team

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