SEO & Marketing
Heading Structure Analyzer - H1–H6 Outline Checker
Paste your page HTML and visualise the H1–H6 heading outline. Detects multiple H1 tags, skipped heading levels, empty headings, and other structural issues.
7 headings found
Heading outline
- H1Running Shoes Guide 2024
- H2Best Shoes for Beginners
- H3Budget Options
- H3Mid-range Options
- H2Trail Running Shoes
- H3Key Features
- H2Conclusion
Issues (0)
✓ No issues detected.
Why heading structure matters for SEO
Search engines use heading tags to understand the hierarchy and topics of a page. A clear, logical heading structure - H1 for the primary topic, H2 for main sections, H3 for subsections - makes your content easier to understand for both crawlers and users.
Common heading mistakes
- Multiple H1 tags - dilutes the primary topic signal. Use one H1 per page.
- Skipped levels - jumping from H1 to H3 breaks the hierarchy and confuses screen readers.
- Empty headings - headings with no text create gaps in the outline and may be flagged as low-quality content.
- Missing H1 - pages without an H1 miss an important on-page SEO signal.
Outline hierarchy rules
- One H1 per page: the H1 is the title of the page and should contain the primary topic or keyword. Multiple H1s dilute its semantic signal.
- H2s for major sections: each H2 represents a top-level section of the page's content.
- H3s for subsections: H3s nest inside H2 sections. Never skip from H2 to H4.
- Never skip levels: going from H1 directly to H3 (skipping H2) violates document outline rules and creates a WCAG violation.
WCAG accessibility requirements
Proper heading structure satisfies WCAG 2.1 Success Criterion 1.3.1 (Info and Relationships, Level A) - a legal requirement under ADA, Section 508, and EN 301 549 in many jurisdictions. Screen reader users rely on headings for navigation: 71% of screen reader users use heading navigation to find content on a page (WebAIM Screen Reader User Survey). A logical heading outline is both a legal obligation and a core usability feature.
SEO impact of headings
Heading tags carry semantic weight in search engine ranking algorithms. The H1 should contain your primary keyword. H2s and H3s can include secondary keywords and related terms, helping search engines understand the breadth of topics covered. Headings also appear in rich snippets and table-of-contents-style search results ("People Also Ask"), making clear heading text important for click-through rate.