Heading Structure Checker

Paste HTML to extract all headings (h1–h6), visualize the hierarchy tree, and flag structural issues like skipped levels, missing h1, and empty headings. All processing runs entirely in your browser.

HTML Input

Cmd+Enter to analyze

Paste HTML and click Analyze to see the heading structure.

Related WCAG Criteria

1.3.1 Info and Relationships 2.4.6 Headings and Labels