Free Tool
HTML Headings Checker (H1–H6)
Check your page's heading hierarchy. Paste HTML to see the full structure tree and identify missing H1s, multiple H1s, and skipped heading levels.
What does an HTML headings checker do?
An HTML headings checker parses a page's HTML and displays the complete heading hierarchy — from H1 down through H2, H3, H4, H5, and H6. It flags structural issues such as missing H1 tags, multiple H1 tags, and skipped heading levels so you can fix them before they affect search visibility and content clarity.
Why heading structure matters for SEO
Headings create a structural outline of your page. Search engines use this outline to understand topic hierarchy, section relationships, and how content is organized. A logical heading structure helps crawlers identify the main topic (H1) and supporting subtopics (H2, H3) without reading every word.
Headings also help users navigate your content. Screen reader users often jump between headings to skim a page. Visitors scanning on mobile rely on visual hierarchy to find relevant sections. When headings are well-structured, both users and search engines can understand your content faster and more accurately.
Learn more about how heading structure fits into broader on-page SEO and how it supports your overall SEO strategy.
H1, H2, H3, and H6 explained
- H1 — The main heading of the page. It describes the page's primary topic. Most pages should have one H1.
- H2 — Major section headings. They divide the page into its main topic areas. Each H2 introduces a distinct section.
- H3 — Subsection headings within an H2 section. They provide further structure within a topic area.
- H4, H5, H6 — Progressively deeper subsection headings. Use them when your content requires multiple levels of nesting. Not every page needs all six levels.
What makes a good heading hierarchy?
A good heading hierarchy is logical and nested. Start with one H1 for the page's main topic. Use H2s for major sections, H3s for subsections within those sections, and so on. The hierarchy should read like an outline — each level nests within the one above it.
You do not need to use all six heading levels. A simple page might only need H1 and a few H2s. The goal is a structure that accurately reflects the content's organization, not mechanical use of every available level.
Common heading mistakes
- Missing H1 — Without an H1, the page has no clear primary topic signal. Search engines and users have to infer what the page is about.
- Multiple competing H1s — Multiple H1 tags can dilute topical clarity. While HTML5 technically allows this with sectioning elements, the conventional best practice is one H1 per page.
- Skipping heading levels — Jumping from H2 to H4 without an H3 breaks the logical hierarchy and confuses assistive technologies and search engines.
- Using headings for visual styling — Headings convey document structure, not appearance. If you need larger text, use CSS. Using heading tags for styling creates a misleading hierarchy.
- Overly generic headings — Headings like "More Info" or "Details" don't communicate what the section covers. Descriptive headings help both users and search engines.
- Poor topical organization — Headings should reflect the content's actual structure. Randomly ordered or unrelated headings make the page harder to understand.
Heading structure examples
Good hierarchy
H1: Complete Guide to On-Page SEO
H2: Title Tags
H3: Optimal Title Length
H3: Writing Click-Worthy Titles
H2: Meta Descriptions
H2: Heading StructureThis hierarchy is logical and nested. The H1 defines the page topic. H2s divide it into major sections. H3s provide substructure within the first section. Each level builds on the one above.
Poor hierarchy
H1: SEO Guide
H3: Title Tags
H5: Meta Descriptions
H1: Heading Structure
H2: SummaryThis hierarchy has multiple problems: two H1s, a jump from H1 to H3 (skipping H2), a jump from H3 to H5 (skipping H4), and no logical nesting. The structure does not accurately represent the content's organization.
Headings and AI/answer-engine visibility
Clear heading structure helps AI systems like ChatGPT, Perplexity, and Google AI Overviews parse and interpret your content. Well-organized sections with descriptive headings make it easier for these systems to identify relevant portions of a page and understand how topics relate to each other.
However, heading structure alone does not guarantee AI citations or rankings. It is one of many factors that contribute to content clarity. The most effective approach is to write descriptive, accurate headings that genuinely help users navigate your content — this serves both human readers and automated systems. Learn more about on-page SEO and how it supports broader search visibility.
Why this matters
Headings create a structural outline of your page. Search engines and AI systems use this outline to understand topic hierarchy, section relationships, and content organization. A logical heading structure helps users navigate your content and helps systems interpret what each section is about.
Related glossary terms
Frequently Asked Questions
An HTML headings checker parses a page's HTML and displays the complete heading hierarchy — from H1 down through H2, H3, H4, H5, and H6. It flags structural issues such as missing H1 tags, multiple H1 tags, and skipped heading levels so you can fix them before they affect search visibility.
Most pages should have one H1 that describes the page's main topic. While HTML5 allows multiple H1 tags when using sectioning elements, the conventional best practice is one H1 per page to avoid confusing search engines about the page's primary subject.
Skipped heading levels happen when you jump from one level to another without the intermediate level — for example, going from H2 directly to H4 without an H3. This breaks the logical hierarchy and makes it harder for search engines and assistive technologies to understand the content structure.
No. Use only the heading levels you need. A simple page might only need H1 and a few H2s. The goal is a logical hierarchy, not mechanical use of every level. Forced or unnecessary headings add clutter without improving structure.
No. Headings convey document structure, not visual appearance. If you need larger or bolder text for visual reasons, use CSS instead. Using heading tags purely for styling creates a misleading hierarchy for search engines, screen readers, and AI systems.
Clear heading structure helps AI systems parse and interpret your content. Well-organized sections with descriptive headings make it easier for systems to identify relevant portions of a page. However, heading structure alone does not guarantee AI citations — it is one of many factors that contribute to content clarity.
This tool parses HTML that you paste directly into the input field. It does not fetch live URLs. It extracts all heading tags (H1–H6) and displays them as a hierarchy tree, flagging missing H1s, multiple H1s, and skipped levels.
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