Is my HTML sent to a server?

No. All minification happens in your browser using JavaScript. Your code never leaves your machine.

What does "collapse whitespace" do?

It replaces runs of whitespace (spaces, tabs, newlines) between tags with a single space, which is safe for most HTML documents. It does not touch content inside or elements.

What does "remove comments" do?

It strips all HTML comments ( ) including conditional comments. Enable this only if you are not using IE conditional comments or server-side comment directives.

Does it remove optional closing tags like or ?

Yes, if you enable "Remove optional tags." The HTML spec allows certain closing tags to be omitted. This saves a few bytes but may break some parsers that expect well-formed XHTML.

Will minifying break my page?

For standard HTML5 pages the output is semantically identical. Pages that rely on exact whitespace inside inline elements (e.g. letter-spacing hacks) may look different. Always test in a browser after minifying.

How is savings percentage calculated?

It is (original size - minified size) / original size * 100, based on UTF-8 byte length.

HTML Minifier

Name: HTML Minifier
Availability: InStock
Author: Nham Vu

Paste HTML, choose minification options, and get a smaller file instantly — all in your browser.

HTML Input

0 bytes

Minification Options

Remove HTML comments Collapse whitespace Remove optional closing tags Remove optional attribute quotes

Minified Output

Minified HTML will appear here

Copied!

Summary

Paste HTML, choose minification options, and get a smaller file instantly — all in your browser.

How it works

Paste or type your HTML into the input panel on the left.
Toggle minification options: remove comments, collapse whitespace, remove optional closing tags.
Click "Minify" to process the HTML client-side with zero server calls.
Review the output and size savings shown in the stats bar.
Click "Copy" to copy the minified HTML to your clipboard.

Use cases

Reduce HTML payload before shipping a static site to production.
Minify HTML email templates to improve deliverability.
Audit how much whitespace bloat exists in a legacy codebase.
Pre-process HTML snippets before embedding them in JavaScript strings.
Speed up page loads by removing developer-only comments.
Compress HTML before Base64-encoding it for inline data URIs.

Frequently Asked Questions

Last updated: 2026-06-09 · Reviewed by Nham Vu