Heading Structure Checker
Detect missing H1s, skipped levels, and heading hierarchy issues that hurt SEO and accessibility.
The Heading Structure Checker parses any block of HTML and audits the H1–H6 hierarchy for missing H1s, multiple H1s, and skipped levels — the three issues that most often hurt SEO and accessibility.
What is the Heading Structure Checker?
Headings give both Google and assistive technology a content outline. A page with no H1 has no clear topic. A page with multiple H1s has no main topic. And a page that jumps from H2 to H4 confuses screen readers and crawlers. This tool reads your HTML, lists every heading, counts each level, and flags structural issues.
How to use the Heading Structure Checker
Steps
- Paste the raw HTML of your page (or a section).
- Click Analyze to view per-level counts and the full ordered heading list.
- Fix flagged issues — add the missing H1, demote duplicates, or fill skipped levels.
Benefits
- Improve SEO with a clean, crawlable outline.
- Improve accessibility for screen-reader users.
- Catch templating bugs (e.g. theme putting H1 around the logo).
Use cases
- Auditing a freshly imported article.
- Theme migration QA.
- Pre-publish editorial review.
Pro tips
- Use exactly one H1 per page.
- Never skip heading levels — H2 → H3 → H4.
- Keep H2s descriptive and keyword-aware.
Frequently asked questions
Can I have more than one H1?
Technically HTML5 allows it, but for SEO clarity stick to one H1 per page.
Are headings a ranking factor?
They are a strong topical signal — not a direct ranking factor on their own.
Should I use the keyword in every heading?
No — use natural variations and semantic terms.
Related SEO tools
- Keyword Density Checker — Measure keyword frequency and density with highlighting.
- Title Tag Analyzer — Score your title length, pixel width, and SEO signals.
- Meta Description Analyzer — Check description length, CTAs, and SERP fit.
- Keyword Placement Checker — Verify your keyword appears in all key locations.