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Heading Structure Checker

v1.1.0

Validate the heading hierarchy of HTML documents.

Analyses the heading hierarchy (H1–H6) in HTML content or a live URL, flags skipped levels, multiple H1 tags, and headings with non-descriptive text, following WCAG 2.1 document structure guidelines.

How to use
  • →Paste HTML or enter a URL to extract and analyse the heading tree.
  • →Review the visual tree — orange nodes indicate a skipped heading level (e.g. H2 → H4).
  • →Fix any red items first: multiple H1 tags or headings that are empty or contain only punctuation.
  • →Export the heading outline as a plain-text list for inclusion in your accessibility audit.