Free Online Heading Structure Checker

1. Paste the page's HTML into the input box.
2. Review the indented outline — indentation reflects each heading's level (H1-H6).
3. Read the issues panel: resolve any "no H1" or "multiple H1" warnings first.
4. Fix skipped levels so headings step down one level at a time without gaps.
5. Add text to any empty headings or remove them, then re-paste to confirm a clean outline.

Headings (H1 through H6) form the document outline of a page. A well-structured page has one H1 describing the whole page, with H2s for major sections and H3-H6 nesting beneath them — much like a table of contents. This hierarchy helps search engines understand topic structure and, crucially, helps people. Screen-reader users navigate by jumping between headings, so the order and levels carry real accessibility weight; WCAG success criteria around info and relationships and heading use depend on a logical sequence.

This checker reads the HTML you paste, builds an indented outline reflecting each heading's level, and runs three checks: it warns when there is no H1 or more than one, flags any skipped level (an H2 jumping straight to an H4 leaves a gap that disorients assistive technology), and catches empty heading tags that add structure but no content.

The analysis is done entirely in your browser on pasted markup — no URL is fetched. Use it to confirm a page reads as a clean, gap-free hierarchy before you publish, which benefits both SEO and screen-reader users at once.