Heading Structure Analyzer
Enter a page URL (or paste HTML) and see a visual tree of every H1–H6, with warnings for skipped levels, missing H1s, and empty headings.
Why heading hierarchy is more than just visual formatting
H1 through H6 tags look like a font-size decision, but they carry real structural meaning to search engines, AI parsers, and screen readers. A properly nested hierarchy — one H1, several H2s beneath it, H3s nested under the relevant H2 — tells a machine exactly how your content is organized: what the page is about, and which sections are subsections of which. Skip a level or use headings purely for visual styling instead of structure, and that signal breaks.
The most common heading mistakes this catches
- Missing H1 — every page should have exactly one clear H1 stating its main topic.
- Multiple H1s— can dilute topical focus and confuse which heading is actually the page's main subject.
- Skipped levels — jumping from H2 straight to H4 breaks the logical nesting a screen reader or parser expects.
- Empty headings — heading tags with no real text inside them, often leftover from a template or CMS bug.
Why this matters for accessibility too
Screen reader users frequently navigate a page by jumping between headings rather than reading top to bottom — a well-structured heading outline is effectively a table of contents for them. A broken hierarchy doesn't just hurt SEO; it makes the page genuinely harder to navigate for anyone using assistive technology.
Frequently asked questions
Why does heading structure matter for SEO?
A clear, logical heading hierarchy helps search engines and AI engines understand how a page's content is organized and which sections matter most. It also directly affects accessibility, since screen reader users often navigate a page by jumping between headings.
Is it bad to skip a heading level, like going from H2 straight to H4?
Yes, generally. Skipped levels break the logical nesting that headings are meant to convey — a screen reader user or an AI parser expects H3 to be a subsection of the preceding H2, and jumping to H4 without an H3 creates a confusing, undefined relationship.
Can a page have more than one H1?
Technically HTML5 allows multiple H1s, but for SEO purposes most practitioners recommend exactly one H1 per page that clearly states the page's main topic, with H2s and below organizing everything underneath it.
Does this tool check the live page or just HTML I paste?
Both. In URL mode we fetch the page live on seosorted's servers (sign in free to run it) and analyze the HTML the server returns. In paste mode the analysis runs entirely in your browser on exactly what you paste. Either way, headings inserted dynamically by JavaScript after load may not appear — for those, copy the fully rendered HTML from your browser's Inspect Element / Elements panel and use paste mode.
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