Free Header Tags Checker — audit your H1–H6 heading structure
The Header Tags Checker is a free header tag analyzer that instantly maps the heading outline of any web page. Enter a URL and the tool fetches your page, extracts every H1 H2 H3 tags down to H6 in document order, counts each level, and checks the essentials — whether you have exactly one H1 tag, whether your heading hierarchy skips any levels, and whether real H2 sections are present. In seconds you get an evidence-based view of your heading structure, drawn directly from the page’s HTML with nothing guessed or estimated.
How the Header Tags Checker works
Checking your heading tags takes three simple steps:
- Enter your URL. Paste any public web page address into the box above and click Check.
- We fetch and parse the page. The tool retrieves your live HTML and reads every H1–H6 heading directly from the source, preserving the exact order they appear in the document.
- You get an instant outline report. Each heading is listed by level with a per-level count, plus checks for a single H1, skipped levels, and the presence of H2 sections — so you know what to fix first.
What are H1–H6 heading tags?
HTML defines six levels of heading tags, from <h1> to <h6>.
They are not just visual styling — they form the semantic document outline that search engines and
assistive technology use to understand how a page is organised. The H1 tag is the top-level
heading that names the page’s main topic. H2 tags mark the major sections beneath it, H3 tags break those sections
into sub-points, and H4–H6 handle progressively finer detail.
Their role in SEO
For HTML headings SEO, a clear heading structure helps Google map the topics and sub-topics on your page and identify which passages answer which questions. This is a genuine on-page signal: pages with a logical outline are easier to crawl, easier to understand, and more likely to surface for the right queries.
Their role in accessibility
Screen-reader users navigate long pages by jumping from heading to heading. A correct H1–H6 sequence lets them build a mental map of your content and skip to the part they need. Broken headings make a page hard to navigate for people who rely on assistive technology, so good heading structure is both an SEO and an accessibility win.
Why you should have exactly one H1
Every page should carry exactly one H1 tag that clearly states its primary subject — think of it as the headline of the page. A single, descriptive H1 sends an unambiguous topical signal to search engines and gives readers and screen-reader users one obvious starting point. Pages with multiple H1s spread that signal thin, while pages with no H1 leave the outline headless. Our header tags checker observes the exact H1 count on your page and flags anything other than one.
Proper heading hierarchy (no skipped levels)
A healthy heading hierarchy nests in order, without gaps. After the H1, use H2 for your main sections; inside an H2, use H3 for its sub-points; only go deeper to H4, H5 or H6 when the content genuinely calls for it. Jumping from an H2 straight to an H4 — skipping H3 — breaks the logical outline and can confuse both crawlers and screen readers. The checker inspects the order your headings appear and highlights any level that is skipped, so you can keep your H1 H2 H3 tags nesting cleanly.
Using headings for structure and featured snippets
Beyond hierarchy, headings are a powerful way to structure content for readers who scan. Descriptive H2 and H3 headings that phrase real questions or clear topics help Google extract answers for featured snippets and other rich results. When a heading poses a question and the paragraph directly beneath it answers concisely, you give search engines an easy passage to lift into the SERP. Presence of meaningful H2 sections — one of the checks this tool runs — is a good sign your page is broken into scannable, snippet-friendly chunks rather than one undifferentiated wall of text.
Header tag best practices checklist
- Use exactly one H1 tag per page that names its main topic.
- Structure the body with descriptive H2 tags for each major section.
- Nest sub-points with H3 tags inside their parent H2, and go deeper only when needed.
- Never skip a level — keep the heading hierarchy in order from H1 down.
- Write headings for humans: clear, keyword-relevant, and often phrased as questions.
- Reserve headings for real structure, not for styling ordinary text large or bold.
Common heading mistakes
- Multiple H1 tags on a single page, diluting the main-topic signal.
- No H1 at all, leaving the page without a clear main heading.
- Skipped levels, such as an H2 followed directly by an H4.
- Using heading tags purely to make text bigger instead of to mark structure.
- A page with no H2 sections, so the content has no scannable outline.
- Vague headings like “Introduction” that describe nothing search engines can index.
Ready to tighten your on-page SEO further? Once your heading structure checks out, run our free Meta Tags Analyzer to audit your title tag, meta description and social tags, then use the full Website SEO Checker to review headings, content, links, structured data and page speed in one place.
Frequently asked questions
What is a header tags checker?
A header tags checker is a free SEO tool that fetches a web page and extracts its full H1–H6 heading outline in document order. It counts how many times each heading level appears and runs checks — such as whether the page has exactly one H1, whether any heading levels are skipped, and whether H2 sections are present. Everything is observed directly from your page’s HTML, so you can see your real heading structure at a glance.
How many H1 tags should a page have?
A page should have exactly one H1 tag. The H1 is the main heading that describes the page’s primary topic, much like the title of a book chapter. Using more than one H1 can dilute the topical signal you send to search engines and confuse assistive technology, while having no H1 leaves the page without a clear main heading. Our header tag analyzer flags pages with zero or multiple H1 tags so you can fix them.
What is the correct heading hierarchy?
A correct heading hierarchy nests logically: one H1 for the page topic, H2 tags for the main sections, H3 tags for sub-points inside each H2, and so on through H6. You should not skip levels — for example jumping from an H2 straight to an H4 — because that breaks the document outline for search engines and screen readers. The checker highlights any skipped levels so your heading structure stays clean.
Do heading tags help SEO?
Yes. Heading tags give your content structure that both search engines and readers can follow. Well-organised H1 H2 H3 tags help Google understand the topics and sub-topics on your page, make content easier to scan, and improve your chances of winning featured snippets. Headings are a core part of on-page SEO, though they work best alongside quality content, not as a standalone trick.
Does this header tags checker change my website?
No. The tool only reads the public HTML of the URL you enter and reports the headings it finds — it never modifies your site. To improve your heading structure, edit the H1–H6 tags in your own page’s HTML, then re-run the checker to confirm the outline is correct.