Minify HTML by removing unnecessary whitespace, comments, and optional tags. Or beautify minified markup back to readable, indented form. Runs entirely in your browser.
HTML minification removes whitespace, comments, and optional closing tags that exist purely for human readability. The resulting markup is rendered identically by browsers but is smaller on the wire, leading to faster page loads — especially important for large server-rendered HTML documents.
Collapses multiple spaces and newlines between tags, preserving content within inline and pre-formatted elements.
Removes <!-- HTML comments --> that are invisible to users but add bytes to every page load.
Beautify minified or poorly-indented HTML back to clean, consistently indented markup.
See original vs. minified size and percentage saved with every run.
A typical HTML page saves 5–20% through minification. Whitespace savings depend heavily on indentation depth — deeply nested templates (like those generated by templating engines) see the biggest gains. Combined with gzip, total transfer savings often reach 60–75%.
HTML minification has the most impact on server-rendered pages where HTML is large, templated, and not aggressively cached. For SPAs where the initial HTML is minimal and content is loaded via JS, the savings are smaller. Always test minified output across browsers before deploying to production.
Whitespace collapsing is safe for most HTML. The only risk is with CSS that uses adjacent-sibling selectors combined with whitespace-sensitive layouts, or JavaScript that reads innerHTML and depends on specific whitespace. Test your minified output — particularly around inline elements like <span> where removing whitespace can affect visual spacing.
The formatter preserves <style> and <script> block contents. The minifier collapses whitespace within them but does not run a dedicated CSS or JS minifier on them. For deep minification of embedded assets, process the CSS and JS separately using the dedicated minifiers on this site.
No. All processing happens entirely in your browser. Your HTML never leaves your machine — important if your markup contains sensitive template data, API endpoints, or internal URLs.
Yes, especially for server-rendered pages. Most CDNs and build tools (Next.js, Nuxt, Astro, Hugo) minify HTML automatically. Use this tool for manual files, email templates, or legacy projects without a build step.