Quick answer: A heading structure checker reads the H1 to H6 tags on a page and shows them as an outline so you can spot SEO and accessibility problems — a missing or duplicate H1, or levels that skip (for example an H2 jumping straight to an H4). Paste your page HTML or a Markdown-style outline below to see the hierarchy and any warnings.
Heading structure checker
Detected automatically. Markdown lines use # for H1, ## for H2, and so on.
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How the heading checker works
Every page should have one clear H1 that names the topic, with H2 to H6 nesting logically beneath it — like a table of contents. Search engines use this outline to understand structure, and screen readers use it to let people jump between sections. This tool extracts your headings (from real HTML tags or Markdown # marks), rebuilds the outline with indentation, and flags three common faults: no H1, more than one H1, and skipped levels where a heading jumps more than one step deeper than its parent. Fixing these makes pages easier to scan for both crawlers and assistive technology.
Frequently asked questions
Should a page have only one H1?Best practice is a single H1 that describes the page. HTML5 technically allows more, but one H1 keeps the outline unambiguous for SEO and accessibility.
Is skipping heading levels bad?Yes for accessibility. Jumping from H2 to H4 breaks the outline that screen-reader users rely on. Keep levels sequential when you go deeper.
Do headings affect SEO?Indirectly. Headings help search engines understand topic structure and help readers scan, which improves engagement. They are a supporting signal, not a ranking trick.
Is this heading checker free?Yes, completely free and private — everything runs in your browser and nothing is sent anywhere.
Keep exploring
Related tools: Readability counter, SERP snippet preview and Schema markup generator.