Heading structure
checker.
Paste your page's HTML source and instantly audit heading hierarchy — catch missing H1 tags, skipped levels, empty headings and duplicate text before search engines do. Free, and nothing leaves your browser.
Paste your HTML source code and click Check headings to see the heading tree and audit results.
A well-structured heading hierarchy helps search engines understand your content and improves accessibility for screen reader users. Every page should have exactly one H1, and heading levels should not skip (e.g. jumping from H2 to H4).
Why heading structure matters for SEO
Headings (H1 through H6) create a content outline that search engines use to understand your page's topic and subtopics. A single, descriptive H1 tells Google what the page is about, while properly nested H2s and H3s signal how supporting ideas relate to the main theme. Pages with a clean hierarchy tend to earn more featured snippets and passage-level rankings.
Beyond SEO, heading order is an accessibility requirement. Screen readers let users navigate by headings, and skipped levels break that navigation. This tool parses your HTML locally in the browser, checks for the most common heading issues and visualizes your structure so you can fix problems before publishing.
Need help with on-page SEO?
Heading structure is just one piece of on-page optimization. I audit and fix title tags, meta descriptions, content hierarchy, internal links and more to help your pages rank higher.
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