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Heading Tag Checker

Paste your HTML source code above to analyze the heading tag structure.

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About Heading Tag Checker

The Heading Tag Checker analyzes the heading structure (H1 through H6) of any web page or HTML document and reports on hierarchy, order, and common mistakes. A well-structured heading outline improves both accessibility and SEO by helping search engines understand content organization. Web developers and content editors use it to catch missing H1 tags, skipped heading levels, and other structural issues.

Key Features

  • Extracts and displays every heading tag from H1 to H6 in document order
  • Visual hierarchy tree that shows heading nesting and indentation levels
  • Detection of missing H1 tags, multiple H1 tags, and skipped heading levels
  • Accessibility compliance checks aligned with WCAG heading guidelines
  • URL-based and direct HTML input modes for flexible analysis
  • Exportable heading outline report for documentation and team review

How to Use Heading Tag Checker

  1. 1

    Enter a URL or paste your HTML

    Provide the web page URL to analyze or paste raw HTML content directly into the input field for immediate heading extraction.

  2. 2

    Run the analysis

    Click the analyze button to extract all heading tags and generate the hierarchy report along with any detected issues.

  3. 3

    Review the heading tree

    Examine the indented heading outline to see whether your content follows a logical H1 > H2 > H3 progression without skipping levels.

  4. 4

    Fix flagged issues

    Address any warnings such as missing H1, duplicate H1 tags, or headings that jump from H2 directly to H4, which confuses screen readers and crawlers.

Common Use Cases

Content accessibility audits

Verify that page headings follow a logical hierarchy so screen reader users can navigate the content effectively, meeting WCAG compliance requirements.

SEO content reviews

Ensure every page has exactly one H1 tag containing the primary keyword, with supporting H2 and H3 tags that reinforce the topic structure.

CMS template validation

Check that your CMS theme or template generates proper heading structures across different page types, catching issues before they affect hundreds of pages.

Why Use Our Heading Tag Checker

Browser DevTools can show headings but not hierarchy errors or accessibility violations. This dedicated checker instantly visualizes the full H1-H6 tree, flags skipped levels and duplicate H1 tags, and aligns findings with WCAG guidelines. No extensions to install, no account needed, just paste a URL or HTML and get an actionable heading audit in seconds.

Audit Without Exposure

Your HTML source code and heading structures are analyzed locally without being uploaded to any external service. Internal page layouts, draft content hierarchies, and unpublished copy remain on your machine throughout the entire audit process.

Frequently Asked Questions

Why should a page have only one H1 tag?
The H1 tag represents the main topic of the page. While HTML5 technically allows multiple H1 tags within sectioning elements, SEO best practice recommends a single H1 so search engines have a clear, unambiguous signal about the page's primary subject.
What happens if I skip heading levels?
Jumping from H2 to H4 without an H3 breaks the logical content hierarchy. Screen readers use heading levels for navigation, so skipped levels confuse assistive technology users and can signal poor content structure to search engine crawlers.
Do heading tags affect search rankings?
Heading tags, especially the H1, carry moderate SEO weight. They help search engines understand the structure and key topics of your content. While not as impactful as title tags or backlinks, proper heading usage contributes to better topical relevance.

Last updated: April 6, 2026