How many H1s should a page have?

Every page should have exactly one H1 tag. The H1 is the main title of the page and signals to Google the central topic of the content. Having multiple H1s is not technically an error, but it can confuse search engines and dilute topical relevance. From an SEO perspective, a single clear H1 optimized with the main keyword is always the best choice.

What is the difference between H1, H2 and H3?

H1, H2 and H3 represent different hierarchical levels of titles. H1 is the main title of the page (there should be only one). H2s are the titles of main sections, like chapters of a book. H3s are sub-sections of H2s, used to delve into specific topics within a section. H4, H5 and H6 follow the same logic for deeper levels, but are rarely needed in practice.

Do headings affect Google ranking?

Yes, heading tags are an on-page relevance signal for Google. H1 in particular helps the search engine understand the main topic of the page. H2s and H3s containing semantic variations of the target keyword help strengthen topical relevance. Additionally, a well-organized heading structure can help achieve featured snippets, which bring significant visibility and traffic.

Can I use multiple H1s on a page?

Technically HTML5 allows multiple H1s on a page, but it is not recommended for SEO. Google itself has clarified that it prefers one H1 per page. Having multiple H1s can make it harder for crawlers to understand the primary topic of the page. If you need to distinguish multiple main sections, use H2 for sections and reserve the H1 exclusively for the main content title.

How long should a heading be?

There is no strict rule, but for H1s it is recommended to stay under 60-70 characters to prevent them from being truncated in search results. H2s and H3s can be slightly longer if necessary, but in general concise and descriptive headings are more effective. Aim to be informative but direct: a heading should immediately clarify what the section is about.

Yes, the Primo Heading Checker is completely free and requires no registration. You can analyze any public URL and instantly get a complete report on the H1-H6 heading structure, with SEO score, detected issues and suggestions to improve your page's title hierarchy.

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Heading Structure Checker

Analyze the H1-H6 heading structure of any web page. Identify hierarchy issues, missing headings and optimize on-page SEO.

🔗Enter the URL to analyze

Why are headings important for SEO?

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H1: one main title only

Every page should have exactly one H1 that clearly describes the main content and contains the target keyword.

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Continuous hierarchy

Don't skip heading levels (e.g. from H2 to H4). A logical structure helps search engines understand content organization.

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Optimal length

Headings should not exceed 70 characters. Titles that are too long lose impact and may be truncated in search results.

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Keywords in headings

Include main keywords in relevant headings (especially H1 and H2) to strengthen the page's topical relevance.

What is a Heading Checker?

A heading checker is a tool that analyzes the structure of heading tags (H1, H2, H3, H4, H5, H6) on a web page and verifies they follow SEO and accessibility best practices. Heading tags aren't just stylistic elements: they communicate content hierarchy and organization to Google, helping the search engine understand what the page is about.

Google uses heading structure to identify the main topic of a page (H1), main sections (H2) and sub-topics (H3 and beyond). A missing or multiple H1, skipped hierarchy levels or empty headings are all negative signals that can reduce content comprehension by crawlers and penalize organic rankings.

Headings also play a fundamental role in web accessibility: screen readers used by visually impaired people navigate content through the heading structure. A logical and continuous H1→H2→H3 hierarchy makes the page accessible to everyone, improving user experience and complying with WCAG (Web Content Accessibility Guidelines).

Why heading structure matters

An optimized heading hierarchy brings concrete benefits for both SEO and user experience.

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Improves Google's understanding

Headings help crawlers map the semantic structure of the page, strengthening topical relevance for target keywords.

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Increases time on page

Well-structured content with clear titles guides reading and reduces bounce rate, improving behavioral signals.

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Facilitates content scanning

79% of users scan pages instead of reading them. Descriptive headings allow users to quickly find the information they're looking for.

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Improves web accessibility

Screen readers navigate pages through headings. A correct structure makes content accessible to all users.

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Featured snippet opportunities

Sections with well-structured H2/H3 and direct answers are ideal candidates for position zero featured snippets.

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Logical content organization

A clear H1→H2→H3 hierarchy makes content more readable, authoritative and shareable, improving engagement metrics.

Heading Tag Best Practices

Follow these guidelines to best structure your page's H1 H2 H3 hierarchy.

✅ What to do

→One H1 per page, with the main keyword
→Place the target keyword in H1, preferably at the beginning
→Follow the sequential hierarchy: H1 → H2 → H3
→Use descriptive headings that summarize the section content
→Include semantic variations of the keyword in H2s
→Keep headings under 70 characters to avoid truncation

❌ What to avoid

→Skipping heading levels (e.g. from H1 directly to H3)
→Using headings only for visual style, without semantic value
→Having multiple H1s on the same page
→Headings that are too long or redundant with the previous title
→Empty headings or with non-descriptive text (e.g. "Section 1")
→Repeating the same keyword in all headings (keyword stuffing)

How Our Heading Checker Works

Three steps for a complete H1-H6 structure analysis, no registration required.

Enter the URL of the page to analyze

Type or paste the full web page address in the field above. The tool accepts any publicly accessible URL, including blog posts, landing pages, articles and homepages.

The tool analyzes the complete H1-H6 structure

The tool fetches the page's HTML code and extracts all heading tags (H1 to H6), building the complete hierarchical map in the exact order they appear in the document.

Get score, issues and improvement suggestions

Instantly get an SEO score from 0 to 100, a list of critical issues, warnings and suggestions ordered by priority, with practical guidance to fix each issue.

Frequently Asked Questions about SEO Heading Tags

Everything you need to know about H1, H2, H3 and heading structure for SEO.

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