A clear, logical heading hierarchy is one of the most fundamental – and most overlooked – aspects of on-page SEO. Headings tell search engines what your page is about, establish content priority, and help screen readers navigate your content. Our Heading Structure Analyser lets you check any page’s H1- H6 structure in seconds, whether you have the URL or just the raw HTML.
Heading Structure Analyser
Check the H1–H6 hierarchy of any page. Paste HTML directly or enter a URL to fetch and analyse the live page. Get a visual outline, issue report, and SEO score instantly.
Enter the full URL of the page you want to analyse. The page must be publicly accessible.
Only heading tags (H1–H6) will be extracted. All other content is ignored.
What We Check
- Error Missing H1 tag
- Error Multiple H1 tags on one page
- Error Skipped heading levels (e.g. H1 → H3)
- Warning Empty heading tags
- Warning H1 longer than 70 characters
- Warning No H2 subheadings found
- Warning Excessive headings at the same level (>15)
- Info Deep nesting (H5 or H6 in use)
- Info Only one heading on the entire page
Enter a URL or paste HTML and click Analyse Headings to see the structure.
Why Choose Our Heading Structure Analyser?
- Two input modes: enter a live URL to fetch and analyse the page in real time, or paste HTML directly for instant client-side analysis.
- Visual heading outline shows your entire H1–H6 hierarchy indented by level, so you can see at a glance how your page is structured.
- SEO score graded A to F, calculated from the number and severity of issues found – so you know exactly where you stand.
- Per-level counts display exactly how many H1, H2, H3, H4, H5, and H6 tags are present on the page.
- Issue detection across nine checks covering errors, warnings, and informational notices.
- Skip warnings highlight any heading that jumps more than one level (e.g. H1 directly to H3), marked visually in the outline with a warning indicator.
- Empty heading detection flags heading tags with no text content that can confuse assistive technologies.
- Copy outline button exports the full heading hierarchy as indented plain text for sharing or documentation.
- Completely free. No account required.
Our Heading Structure Analyser is perfect for:
- SEO professionals auditing on-page structure before publishing or after a content migration.
- Content editors who want to ensure blog posts and landing pages follow a logical hierarchy.
- Web developers checking that CMS-generated pages produce clean, well-ordered heading markup.
- Accessibility consultants verifying that heading levels work correctly for screen reader navigation.
- Anyone who wants to catch H1 errors, skipped levels, or missing subheadings before they affect rankings.
How to Use Our Heading Structure Analyser:
- Choose your input mode: “Analyse URL” to fetch a live page, or “Paste HTML” to analyse markup directly.
- Enter the full URL of the page (including https://) or paste your HTML into the text area.
- Click “Analyse Headings” – the tool will extract and evaluate the complete heading structure.
- Review the SEO score and per-level heading counts at the top of the results panel.
- Read through the Issues Found section to see any errors, warnings, or informational notices.
- Study the Heading Outline to understand the visual hierarchy – skipped levels are flagged with ⚠.
- Use the Copy Outline button to save the hierarchy as plain text for your records or client reports.
A well-structured heading hierarchy is not just good SEO practice – it is the backbone of accessible, readable web content. Use this tool regularly as part of your content QA workflow, and you will catch heading errors before they go live.
Frequently Asked Questions
Why does heading structure matter for SEO?
Search engines use heading tags to understand the topics and subtopics covered by a page. An H1 signals the primary subject, H2s indicate major sections, and deeper levels break those sections into finer detail. A clear, logical hierarchy helps Google and other search engines parse and rank your content accurately. Broken hierarchies - such as skipped levels or multiple H1s – can make it harder for crawlers to understand your page’s structure, which can dilute keyword relevance and harm rankings.
Should every page have exactly one H1?
Yes, in virtually all cases. The H1 should describe the single most important topic of the page and there should only be one of them. Multiple H1s split the primary topic signal, which can confuse search engines about what the page is actually about. Some CMS themes automatically insert the post title as an H1, so it is worth checking that your theme is not adding a second one inside the content area.
What does it mean when the tool flags a skipped level?
A skipped level means the heading hierarchy jumps more than one step – for example, going directly from H1 to H3 without an H2 in between. This breaks the logical document outline and can confuse both search engines and screen readers. The fix is usually to change the offending heading to the correct level, or to restructure the content so that an appropriate intermediate heading exists.
Can I use this tool on password-protected or staging pages?
URL mode fetches pages server-side, so the target page must be publicly accessible without authentication. If your page is behind a login, staging password, or IP restriction, URL mode will return an error. In that case, switch to HTML paste mode - copy the page’s source code from your browser’s developer tools (View Page Source) and paste it directly into the tool.
How is the SEO score calculated?
The score starts at 100 and deducts points for each issue found: 20 points per error (missing H1, multiple H1s, skipped levels), 10 points per warning (empty headings, overlong H1, no H2 subheadings, excessive headings at one level), and 3 points per informational notice (deep nesting, single heading on page). The final score maps to a letter grade - A (90+), B (75+), C (60+), D (45+), or F (below 45). A perfect score of 100 means no issues were detected.
