Header tags for SEO: how to use H1, H2 and H3

Header tags (H1 to H6) mark the headings on a web page. They aren't a magic ranking trick, but they do two useful jobs: they help people scan the page, and they help search engines and AI systems understand how the content is organised.

What header tags are

HTML has six heading levels:

<h1>Header tags for SEO</h1>
  <h2>What header tags are</h2>
  <h2>How to structure headings</h2>
    <h3>The H1</h3>
    <h3>H2 and H3</h3>

The number shows the level, not the size. Designers can style an H2 any size they like. What matters is that the levels describe the structure: H2s are main sections, H3s are subsections of an H2, and so on.

Do header tags help SEO?

Google uses headings to understand what each part of a page is about. A clear H1 confirms the topic. Descriptive H2s can help a section rank for a related question, and Google sometimes uses headings to build featured snippets or jump links. Headings also help accessibility: screen reader users often jump from heading to heading to find what they want.

What headings don't do is boost rankings because they contain keywords. Writing "Best Cheap Running Shoes" in five H2s doesn't help. Headings that describe the content honestly do.

How to structure headings

The H1

• Use one H1 per page that states the main topic.
• It should match the title tag in meaning, though it doesn't have to be word for word.
• Put it at the top of the main content, not in the logo or a banner.

Google has said multiple H1s won't break anything. One clear H1 is still the simplest, clearest signal.

H2 and H3

• Use H2s for the main sections. A reader scanning only the H2s should understand the page.
• Use H3s for points within an H2 section.
• Don't skip levels for styling, such as jumping from H2 to H5 because H5 looks smaller.
• Write headings as plain, descriptive phrases. Questions work well when the section answers one.

Common heading mistakes

1. No H1, or the H1 is the logo. Many themes wrap the site name in an H1 on every page.
2. Headings used for styling. Sidebar titles, footer labels and "Related posts" as H2s add noise to the outline.
3. Skipped levels: H1 followed by H4.
4. Empty headings left behind by page builders.
5. Vague headings like "Overview" or "More info" that tell nobody anything.
6. Keyword stuffing the same phrase into every heading.

How to check a page's headings

Open the checker above, enter any address, and you'll see the page's full heading outline in order, with warnings for missing H1s, skipped levels and empty headings. You can also check by hand: in Chrome, right-click a heading and choose Inspect to see its tag.

Headings and AI answers

AI search tools break pages into chunks and often use headings to decide where one idea ends and the next begins. A page with clear, descriptive headings and a direct answer under each one is easier to quote. The same structure that helps readers helps AI search too. See SEO writing tips for more on answer-first writing.