Will this break a code block or textarea default text?

It can - this tool strips whitespace and newlines as plain text throughout the whole document, with no special exception for or content, so formatting-sensitive sections should be checked carefully in the output.

HTML Minifier — Free Online Tool

Why minify HTML

Minifying strips comments and collapses unnecessary whitespace so the browser downloads fewer bytes. On a large page this can meaningfully shave load time, which matters both for user experience and for Core Web Vitals, a set of page-experience signals Google uses in ranking.

What this specific tool actually removes

HTML comments are stripped entirely, whitespace sitting directly between two tags is collapsed to nothing, any run of multiple spaces elsewhere is collapsed to a single space, and all newlines are removed - a straightforward set of text-level passes rather than a full HTML parser rewriting the document structure.

A real limit worth knowing before deploying minified output

Because whitespace and newlines are stripped everywhere in the document as plain text, content inside a <pre> block or a <textarea>'s default value - where whitespace and line breaks are meant to display exactly as written - can have that formatting altered along with everything else. If your page includes preformatted code blocks or pre-filled textareas, check that section of the minified output carefully, or exclude it from minification and handle it separately.

Why minifying is a build step, not a source-editing step

Keep your actual working HTML file readable and commented, and only run it through minification as part of deploying - treating the minified output as a build artifact, not something you edit directly, since any future change would need to happen in the original source and be re-minified afterward.

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Is minified HTML harder to maintain?

Yes - keep your readable source file and only minify the version you actually deploy, typically as part of a build step.

Will this break a <pre> code block or textarea default text?

It can - this tool strips whitespace and newlines as plain text throughout the whole document, with no special exception for <pre> or <textarea> content, so formatting-sensitive sections should be checked carefully in the output.

Does this remove JavaScript or CSS comments too?

Only HTML-style comments () are stripped. Comments inside <script> or <style> blocks use different comment syntax and are not specifically targeted by this tool.

How much size reduction should I expect?

It varies by how much whitespace and commenting the original HTML has - pages with heavy indentation and comments see a bigger reduction than already-compact markup. The tool shows the exact percentage saved after each run.

Should I minify HTML if my server already compresses responses with gzip?

There's still some benefit, since minifying reduces the amount of data gzip has to compress in the first place, though the combined savings are smaller than minifying alone would suggest, since gzip already handles a lot of repetitive whitespace efficiently.

HTML Minifier