Heading Structure Checker
Paste your page HTML to see its heading outline and find missing, repeated or skipped headings.
Why heading order matters
Headings give a page its outline. Search engines use them to understand how a page is organised, and screen reader users jump from heading to heading to find their way around. A clear order, from one H1 down through H2 and H3, helps both.
| Check | Why it matters |
|---|---|
| Exactly one H1 | It names the page. None is a gap; several can blur the main topic |
| No skipped levels | Going from H2 straight to H4 breaks the outline for screen readers |
| No empty headings | An empty heading is announced as a blank stop |
| Starts with the H1 | The first heading should be the page title |
Paste your page's HTML and the tool lists every heading in order as an indented outline, then reports problems. Use headings for structure rather than for size: choose the level by meaning and style it with CSS. The check runs in your browser on the text you paste. Nothing is fetched or uploaded, and it cannot see headings that a script adds after the page loads.
Frequently asked
Can I have more than one H1?
HTML allows it and Google handles it, but one H1 per page is the clearest choice for readers and screen readers. This tool flags more than one as something to check, not as an error.
Is skipping a heading level a problem?
It is not a ranking penalty, but it makes the outline confusing for people using screen readers. Aim to go down one level at a time, such as H2 then H3.
Does heading order affect SEO?
Headings help search engines understand your page, but there is no set order that ranks higher. Clear, descriptive headings that follow the real structure of the content are the goal.
Why can't I enter a URL?
The tool runs in your browser, and browsers block reading another site's page. Paste the page source instead.
Is my HTML uploaded?
No. The check runs in your browser and nothing is sent to a server.