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Heading Structure Checker

Analyze H1–H6 hierarchy for any page. Find missing H1s, skipped levels, and structural issues — just like the Lumina extension.

Why heading structure matters

Search engines use headings (H1–H6) to understand page structure and content hierarchy. A proper heading structure helps Google determine topic relevance and improves accessibility for screen readers.

Common issues: missing H1, multiple H1s, skipped heading levels (e.g. H1 → H3), empty headings, and headings that are too long. The Lumina extension checks all of these in real-time and lets you highlight headings directly on the page.

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FAQ

How many H1 tags should a page have?+
Best practice is exactly one H1 per page. While HTML5 technically allows multiple H1s, Google recommends a single H1 that describes the page's main topic.
What is a skipped heading level?+
Going from H1 directly to H3 (skipping H2) breaks the semantic hierarchy. Screen readers and search engines expect a logical progression.

Highlight headings on any page

Lumina shows color-coded heading badges directly on live pages and detects structural errors automatically.

Add Lumina to Chrome — Free