Format HTML markup with readable indentation and structure.
Your HTML is processed locally in the browser. Nothing is uploaded or stored.
No — the tag itself is indented in place, but the CSS or JS inside it is left exactly as typed. Format that separately with the CSS Formatter or JavaScript Formatter, then paste it back in.
No. Only whitespace and indentation change — the DOM and page behavior stay identical.
Unclosed tags are auto-closed using standard HTML parsing rules and format fine. A tag closed out of order — a stray </span> that doesn't match anything open — is rejected with a parse error pointing at it.
Both. A snippet without <html>/<body> wrappers formats exactly like a full document — no boilerplate required.
No — formatting runs 100% client-side.