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Heading Structure Checker

Check HTML heading structure for SEO and readability. Analyze H1, H2, H3, skipped heading levels, duplicate headings, empty headings, and page outline issues directly in your browser.

Paste rendered HTML, a copied page section, Markdown headings, or a simple outline. The analysis runs locally in your browser.

Options

Checks H1 count, empty headings, duplicate text, skipped levels, heading length, and outline depth. A useful heading structure should make sense to real users first.

Output

Heading structure output will appear here.
Heading analysis happens directly in your browser. Your HTML or outline is not uploaded to a server.

Checking Page Headings for SEO and Readability

Headings help people understand the structure of a page. They also help search engines and assistive technology understand how the page is organized. A clear H1, useful H2 sections, and sensible nested H3 headings make content easier to scan.

This Heading Structure Checker reads pasted HTML, Markdown, or plain outlines and reports common issues such as missing H1, multiple H1 headings, skipped heading levels, duplicate headings, empty headings, and overly long headings.

Reviewing a Page Heading Outline

  1. Paste HTML from a page, template, CMS editor, or rendered source.
  2. Choose HTML, Markdown, or plain outline input.
  3. Select balanced, strict, or relaxed checking.
  4. Run the checker and review the heading outline.
  5. Fix missing H1, skipped levels, duplicate headings, or unclear structure.

Common Heading Structure Checker Use Cases

  • Checking whether a page has one clear H1 heading.
  • Reviewing H2 and H3 structure before publishing content.
  • Finding skipped heading levels like H2 directly to H4.
  • Finding duplicate or empty headings in templates.
  • Checking generated pages, blog posts, landing pages, and tool pages.
  • Preparing cleaner outlines for SEO, accessibility, and readability.

Example Clean Heading Structure

H1: JSON Formatter Online
  H2: Formatting JSON for Cleaner Debugging
    H3: Common JSON formatting use cases
  H2: How to Use This JSON Formatter
    H3: Paste your JSON
    H3: Format or validate the input

Headings Should Not Be Written Only for Search Engines

A heading structure is useful when it helps real people understand the page. Avoid stuffing keywords into every heading. Instead, use headings to describe sections naturally and make the content easier to scan.

Search engines can use headings as one signal, but headings are not a magic ranking switch. Clean structure, helpful content, internal links, fast pages, and a good user experience all matter together.

Frequently Asked Questions

What does a Heading Structure Checker do?

It reads page headings and shows the outline, H1 count, skipped levels, duplicate headings, empty headings, and other structure issues.

Should a page have only one H1?

One clear H1 is still a practical standard for most pages because it makes the main topic obvious to people and tools.

Are skipped heading levels bad?

They can make a page outline harder to follow. A jump from H2 to H4 may be confusing unless there is a clear reason.

Can this check Markdown headings?

Yes. Choose Markdown input and paste headings written with #, ##, ###, and other Markdown heading levels.

Is my HTML uploaded anywhere?

No. Heading analysis happens directly in your browser.