HTML Minifier

Minify HTML by removing whitespace and comments to reduce file size.

HTML Input0 chars

Options

Remove HTML commentsCollapse whitespaceRemove optional quotes

Minified Output

Minified HTML will appear here…

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I Used to Skip HTML Minification — Until Page Speed Scores Wrecked My Rankings

I was one of those developers who thought minification was something you set up in your build pipeline once and forgot about. Then I started hand-coding some landing pages for Textpire, and I kept seeing these ugly 65/100 scores on PageSpeed Insights. The culprit every single time: render-blocking resources and excessive HTML payload. That's when I actually started caring about this stuff.

HTML minification is the process of removing everything from your HTML that the browser doesn't need — whitespace between tags, indentation, code comments, optional quote marks. The browser parses it identically either way. But the file size drops, the bytes over the wire drop, and your Time to First Byte improves. On a busy site serving hundreds of requests per second, that adds up to something meaningful.

What This Tool Actually Removes

There are three things you can toggle on or off. First, HTML comments — anything between . These are useful during development but serve zero purpose in production. Second, whitespace collapse — this removes newlines between tags and collapses sequences of spaces down to single spaces. Third, optional quote removal — attributes like class=foo are technically valid HTML5 without quotes when the value has no spaces. Most people leave this one off because it makes the output harder to read if you ever need to inspect it.

The output box shows you the byte reduction as a percentage. Typical results for well-structured HTML are 15 to 30 percent. If your file is heavily commented or uses a lot of indentation, you can hit 40 percent or more. That's not insignificant for a file that gets fetched on every page load.

When You Actually Need This

The honest answer is: if you're using a modern framework or build tool, you probably don't need this. Next.js, Webpack, Vite — they all handle minification automatically. Where this tool earns its keep is in three specific situations.

First, hand-coded static HTML. If you're writing a landing page or microsite without a build step, this is your minifier. Paste the file, copy the output, done. Second, email templates. Email clients like Outlook are notoriously picky about HTML, and bloated templates with excessive whitespace can trigger rendering issues or get flagged by spam filters. Third, CMS-generated HTML. Some older CMS platforms output verbose HTML with whitespace padding everywhere. You can clean up the templates manually or run the exported HTML through this.

If you're cleaning up the full page, you'll probably want to pair this with a CSS Minifier and clean up any embedded scripts too. And if your HTML has unwanted tags you want to strip entirely rather than just minify, the HTML Tag Remover handles that.

Privacy and How It Works

Everything runs in your browser. Your HTML is never sent to a server. The processing uses JavaScript string operations — no external libraries, nothing loaded from a CDN. You can use it on internal code, client work, or any HTML you can't share with a third party.

Frequently Asked Questions

Will minified HTML break my page layout?

No. Whitespace between HTML tags is ignored by browsers during rendering. The visual output and DOM structure are identical before and after minification. The only risk is code that relies on specific whitespace in text content, which is rare.

Should I minify HTML if I'm using Next.js or similar?

Probably not necessary — Next.js minifies HTML output automatically in production builds. This tool is most useful for static HTML files, email templates, or CMS exports where you don't have an automated build pipeline.

What is the typical file size reduction?

Between 10 and 35 percent for typical production HTML. Files with heavy commenting and indentation can see 40 percent or more. The tool shows the exact reduction percentage after minification.

Does removing optional quotes cause browser compatibility issues?

In practice, no — HTML5 allows unquoted attribute values as long as they contain no spaces or special characters. However, some older parsers and validators may flag it. Leave the quotes option off unless you specifically need the extra size reduction.

Can I minify an entire website at once?

This tool processes one HTML file at a time. For bulk minification across a whole site, a build tool like Webpack or a task runner like Gulp with an HTML minifier plugin is the right solution.