Formatters & Validators

HTML Formatter / Validator

Tidy HTML markup indentation and flag errors.

Collapse text whitespace

Input0 chars

Output

Guide & explanation

The HTML Formatter / Validator re-indents markup and flags tag-structure problems.

Format and minify

Format writes one block tag per line with indentation. Minify strips comments (except conditional <!--[if ...]> comments) and collapses whitespace between tags, keeping a single space between inline elements.

The contents of pre, textarea, script, and style are not touched, because whitespace inside them is significant.

Example

<ul><li>One<li>Two</ul>

becomes

<ul>
  <li>One</li>
  <li>Two</li>
</ul>

Reading the results

Balanced tag structure — the element count and depth are shown.
Structure issues — a line:column list, e.g. <div> opened but never closed or </span> has no opening tag.

The check is structural (tag pairing), not full HTML-spec validation. The Collapse text whitespace toggle controls whether text between tags is squashed.