Heading Structure Checker
Paste page HTML and get a readable H1-H6 outline with warnings for missing H1s, multiple H1s, and skipped heading levels.
See your page outline at a glance
Heading tags are the skeleton of a page. Screen readers use them to let people jump between sections, and search engines lean on them to understand how your content is organized. The problem is that visual styling can completely mask the underlying structure — a page can look perfectly designed while the HTML jumps from an H2 straight to an H5, hides its H1, or scatters several H1s across the page.
Paste your HTML and this checker extracts every heading into an indented H1–H6 outline that mirrors the real hierarchy, then flags the common problems: a missing H1, multiple H1s, and skipped levels. Fixing those makes the page more accessible and easier for search engines to parse — aim for one clear H1 and a logical, unbroken descent through the levels.
Private and instant
Your HTML is parsed locally in your browser — nothing is fetched or uploaded, so you can check unpublished pages safely.
Frequently Asked Questions
Why does heading structure matter?
Headings help readers, assistive technology, and search engines understand the structure of a page.
Is more than one H1 always bad?
Not always, but one clear H1 is the safest default for marketing and content pages.
Does this fetch my page?
No. Paste HTML directly so the check runs locally.
Need metadata, content structure, and technical SEO cleaned up across a full site? I can help.