HTML Tools

HTML Formatter

Paste or open HTML, choose indentation and comment handling, format locally, inspect browser-parsed structure and source warnings, preview without scripts, then copy or download the result.

Indentation

Comments

Open HTML file

HTML source

<!doctype html><html lang="en"><head><title>Example</title></head><body><main><h1>Release notes</h1><p class="lead">A <strong>small</strong> document.</p><ul><li>One</li><li>Two</li></ul></main></body></html>

Formatted HTML

0Parsed elements

0Headings

0Output lines

0Output UTF-8 bytes

Browser-local does not mean standards-complete

HTML parsing is error tolerant. Source diagnostics, sandboxed previews, and transformations do not replace full conformance, security, or production-browser testing.