Free H1 & Heading Structure Checker
Check your H1 tag and the full H1-H6 heading hierarchy of any page. Finds missing and duplicate H1s, and skipped heading levels.
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Why the H1 and Heading Structure Matter
The H1 is the strongest topical signal on a page after the title tag. The H2-H6 headings beneath it group your content into sections, which helps search engines understand how the page is organised and helps readers scan it. A page with one clear H1 and a logical hierarchy under it is easier for both to interpret.
Heading Best Practices
- Use exactly one H1 per page, describing the page's main topic.
- Make every heading descriptive on its own, without needing the paragraph beneath it.
- Move down one level at a time: H1 to H2 to H3. Do not jump from H1 straight to H3.
- Choose heading levels for structure, not for font size. Use CSS to control appearance.
Common Heading Mistakes
- Multiple H1 tags: more than one H1 leaves search engines without a single clear topic for the page.
- Keyword stuffing: an H1 crammed with keywords reads badly and helps nobody.
- No H1 tag: the page has no primary topic signal at all.
- H1 does not match the content: the heading promises something the page does not deliver.
- Skipped levels: jumping from H2 to H4 implies a section that is not there.
Headings and SEO
Search engines use headings to work out what a page covers and how its sections relate. A clear outline will not rank a weak page, but a broken one — no H1, several competing H1s, or levels that jump around — makes a strong page harder to interpret. Screen readers use the same outline to navigate, so the structure matters for accessibility as well.
Mobile and Readability
On mobile devices, your H1 is often the first text users see. Make it compelling and clear to improve click-through rates and user engagement.
For the wider picture, see our guide to heading structure and on-page SEO. Heading order is also a WCAG requirement, covered in WCAG and web accessibility.