HTML Minifier

HTML files carry significant formatting overhead — indentation, comments, optional closing tags, and default attribute values that browsers ignore. In template-generated pages with deep nesting, this overhead can account for 20–30% of the document size. Minification strips it away, producing a smaller file that downloads and parses faster without changing what the browser renders.

The minifier collapses consecutive whitespace characters (spaces, tabs, newlines) into a single space and removes whitespace between block-level tags where it has no visual effect. It is careful with elements where whitespace matters: content inside pre, code, textarea, script, and style tags is left completely untouched, and a single space is preserved between inline elements to maintain word separation.

Standard HTML comments are removed entirely. Conditional comments used by older versions of Internet Explorer are detected and preserved, since they contain functional markup. If your build process uses comments as section markers, minify after the build step so those markers have already served their purpose.

Certain HTML attributes have default values that browsers apply automatically: type="text/javascript" on script tags, type="text/css" on style tags, and method="get" on forms. The minifier can remove these redundant attributes safely. Attribute values that don't contain special characters can also have their quotes removed, though this tool keeps quotes for maximum compatibility.

Most web servers compress HTML with gzip or Brotli before sending it. Gzip is very good at compressing repeated whitespace, so the additional savings from minification after gzip are modest — typically 3–8%. The real benefit is reducing the raw document size that the browser must parse, which is especially noticeable on large pages with thousands of DOM nodes.

All processing runs in your browser. No HTML is sent to any server, making this safe for internal applications, admin panels, and client projects.