Why do skipped levels matter?

Jumping heading levels breaks the document outline that screen readers and search engines rely on to understand structure.

SEO ToolsInstant

Heading Structure Checker

Analyze heading order and flag skipped levels or multiple H1 tags.

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Examples

See what this tool can do.

Check your outline

See whether your page has a logical, nested heading structure.

Find multiple H1s

Spot pages with more than one H1 that should be demoted.

Tips & tricks

Get the most out of it.

1Use one H1 that describes the page's main topic.
2Don't skip levels — go H2 then H3, not H2 then H4.
3Headings are for structure, not just visual size.

About Heading Structure Checker

What this tool does

Heading Structure Checker analyses the H1–H6 hierarchy in your HTML and flags skipped levels or multiple H1s.

How to use it

Paste your page HTML.
See the heading outline in order.
Fix skipped levels or extra H1s it flags.

How it works

The HTML is parsed to extract headings in document order, then the tool checks that levels don't jump (e.g. H2 to H4) and that there's a single, clear H1.

Privacy

This tool runs entirely in your browser. The text, HTML or settings you enter are processed locally and never uploaded to a server.

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Frequently asked questions

HTML5 technically allows it, but a single clear H1 is best for accessibility and SEO clarity, so the tool flags extras.