Heading Structure Checker
Check a page's heading hierarchy — H1 to H6 — for a logical, accessible structure.
The outline that holds a page together
Headings are not just big text; they form the outline of a page, and both screen readers and search engines rely on that structure to understand how content is organised. This lays out the heading hierarchy so you can see whether it makes sense: one clear H1, subsections in H2, their details in H3, without levels skipped or jumbled.
Paste your content or headings and see the hierarchy laid out.
The rules worth following
A well-structured page has exactly one H1 that states what the page is about, then descends in order without skipping — an H2 should not leap straight to an H4. Screen-reader users navigate by jumping between headings, so a broken hierarchy genuinely hampers accessibility, and search engines use it to grasp your topics and subtopics. Checking the outline catches the common problems: multiple H1s, skipped levels, or headings used just to make text big rather than to mark real structure.
Common questions
How many H1s should a page have?
One, stating what the page is about. The rest of the structure descends through H2, H3 and so on in order.
Why does heading order matter?
Screen readers navigate by headings and search engines read the structure, so skipped or jumbled levels hurt both accessibility and clarity.
Is anything uploaded?
No. The check happens in your browser.