Heading Structure Checker
Paste a page's HTML to see its H1-H6 outline and catch a missing H1, multiple H1s, or skipped heading levels.
A clear heading hierarchy helps both search engines and screen readers understand your page. Paste a page's HTML to see the full H1-H6 outline and flag the common problems: no H1, more than one H1, or a skipped level (like an H2 jumping straight to an H4). It runs in your browser.
Three steps
Paste your HTML
Copy the page's HTML into the box.
Read the outline
See every heading in order, indented by level.
Fix the flags
Resolve a missing or duplicate H1 and any skipped levels for a clean hierarchy.
Common questions
Should a page have only one H1?
Conventionally yes — one H1 that describes the page, with H2-H6 nesting beneath it. This tool flags zero or multiple H1s.
What is a skipped heading level?
Jumping from an H2 straight to an H4 (skipping H3). It breaks the document outline; this tool flags it.
Keep going
Audit your whole site, not just one check
CrawlX runs 65+ technical checks in the cloud and ships the fix as a pull request. Free for 500 URLs.