Heading Structure Visualizer

About the Heading Analyzer

Headings form the outline of your page. Search engines and screen readers use them to understand structure and hierarchy. Common mistakes — a missing H1, multiple H1s, or a jump from H2 to H4 — confuse both crawlers and users. This tool parses your HTML and shows the heading tree with clear warnings for each problem.

How to use the Heading Structure Visualizer

1. 1Paste your raw HTML into the input area. The tool extracts every heading tag from H1 through H6.
2. 2The tree view on the right renders your headings as a nested outline, indented to reflect their level.
3. 3Issues are flagged inline with colored badges: a missing H1, more than one H1, skipped levels, and empty headings.
4. 4Use the summary at the top to see a quick count of each heading level and the total number of issues found.

Best practices

• Use exactly one H1 per page. It should describe the page content and usually matches or complements the title tag.
• Never skip heading levels. Going from H2 to H4 breaks the outline for screen readers and crawlers.
• Use headings for structure, not styling. If you need larger text, use CSS — do not promote a paragraph to H3 for visual size.
• Keep H2s as logical sections of the page. Think of them as chapter titles in a book.
• Avoid empty headings. They add no information and confuse the outline.