One H1 per page
Make it describe the page topic, close to the title tag.
Heading Structure Checker (H1–H6)
See a page's heading outline at a glance and spot the problems that confuse readers, screen readers and search engines: a missing H1, skipped levels, empty or overlong headings.
- 100% free
- No sign-up
- Runs in your browser
Right-click a page and choose View page source, then copy and paste the HTML here.
Heading outline
Issues found
How to use
How to use the Heading (H1–H6) Structure Checker
- Open the page in your browser and view the page source.
- Copy the HTML and paste it into the box.
- Review the outline and the list of issues.
- Fix the headings in your CMS or code, then check again.
Private by design. Everything is generated in your browser. Your URLs, content and settings are not uploaded or stored.
About this tool
Why heading structure matters
Headings are the outline of your page. A single H1 states the main topic, H2s break it into sections, and H3s sit inside those sections. Screen reader users jump between headings to navigate, and search engines use them to understand how the content is organised.
Clear headings also help with answer engine optimisation. AI assistants and featured snippets often pull an answer from the text directly under a heading that matches the question. Headings phrased as the questions people actually ask, followed by a direct answer, give them exactly what they look for.
Good to know
Heading tips
Do not skip levels
Go from H2 to H3, not from H2 straight to H4.
Do not use headings for styling
If text only needs to look bigger, use CSS instead.
Use question-style headings
Headings like "How long does delivery take?" work well for AEO.
FAQ
Heading (H1–H6) Structure Checker FAQs
Is having more than one H1 bad?
It is valid HTML, but a single H1 keeps the main topic clear for users and search engines.
Does the tool fetch pages for me?
No. Browsers cannot read other websites for security reasons, so paste the HTML.
Does it check text styled to look like headings?
No. Only real H1 to H6 tags count, which is what search engines and screen readers use.
Is my HTML uploaded?
No. It is analysed in your browser.
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