Heading Structure Analyzer.
Paste any page's HTML source to visualize the H1–H6 hierarchy, spot skipped levels, missing H1 tags, empty headings, and overly long heading text.
- Parses all H1 through H6 tags and displays them as a visual tree
- Flags skipped levels, multiple H1s, empty headings, and too-long headings
- Summary counts by heading level plus error and warning counts
How it works
Paste your HTML
Copy the HTML source of any page (from View Source in your browser) and paste it into the input.
Extract headings
The tool parses all H1 through H6 tags from your HTML, preserving their order and hierarchy.
Review the hierarchy
See your heading structure as a visual tree with level badges, indentation, and issue indicators.
Fix structure issues
Address any warnings or errors in your hierarchy, then re-analyze to verify your corrections.
Questions
Why does heading structure matter for SEO?
Heading structure helps search engines understand the topical hierarchy and content organization. Properly nested headings (H1 > H2 > H3) signal which topics are primary and which are subtopics. Google uses headings as contextual signals for ranking. Beyond SEO, heading structure is critical for accessibility because screen readers use headings to help visually impaired users navigate.
How many H1 tags should a page have?
Best practice is exactly one H1 tag per page. While HTML5 technically allows multiple H1 tags within sectioning elements, the SEO community and Google representatives recommend a single H1 that clearly describes the main topic. Your H1 should include your primary target keyword.
What does it mean when heading levels are skipped?
Skipping levels means jumping from H1 directly to H3 without an H2. This breaks the logical document hierarchy and can confuse search engines and assistive technologies. Headings should follow sequential order: H1 for page title, H2 for major sections, H3 for subsections within each H2, and so on.
Should I include keywords in my heading tags?
Yes, including relevant keywords in headings is an SEO best practice, but should be done naturally. H1 should include your primary target keyword. H2 and H3 are good places for secondary keywords. Avoid keyword stuffing. Write for readers first, ensure keywords are naturally present.
Is this tool free?
Yes. No sign-up, no limits, no data collection. All analysis happens in your browser; your HTML never leaves your device.
Run these next.
All 25 checkersAIO Copilot runs checks like this every week, on every site.
SEO, AI search and Google Ads in one app, for your own site or your clients', with every figure showing its working. Priced per site; we email your price and the installation steps.