heading hierarchy
Also called: heading structure, heading order, heading levels
Heading hierarchy is the logical nesting of a page's HTML heading elements (H1 through H6) so their levels descend in order without skipping a rank. It gives the page an outline: one H1 as the title, H2s for main sections, and H3s for subsections beneath them.
HTML gives you six heading levels, <h1> down to <h6>. Rank signals importance, not size. A heading styled small by CSS is still structurally above a lower-ranked one, so you never reorder <h2> and <h3> just to match a visual design.
The rule most pages break is skipping levels. web.dev calls jumping from an <h2> straight to an <h4> an anti-pattern because it breaks the outline model, and Lighthouse ships a “Headings don’t skip levels” audit to catch it. Screen reader users lean on this outline: web.dev notes they most often navigate an unfamiliar page by exploring its headings, so a broken hierarchy reads as missing content.
Does Google rank on it?
Not directly. Google’s SEO Starter Guide says having headings in semantic order is “fantastic for screen readers, but from Google Search perspective, it doesn’t matter if you’re using them out of order.” Headings still help crawlers and AI answer engines understand what each block of text covers, which is why clean structure matters for getting passages lifted into snippets and AI answers, even though the strict H1-H2-H3 sequence is not a ranking factor.
Practical shape: one <h1> per page (the title), an <h2> for each main section, <h3> for subsections under it. Reserve headings for real structure, not for styling a line you want to look bigger.
How it affects your traffic
Broken heading structure is one of the most common flags in an on-page audit: multiple H1s, skipped levels, or headings used purely for font size. Fixing it makes pages easier for people to scan and gives search crawlers and AI answer engines cleaner, self-contained passages to quote, which helps you win featured snippets and AI Overview citations where a single well-scoped section gets pulled. It rarely moves rankings on its own, so we treat it as one input inside a full on-page pass (titles, headings, internal links, schema) rather than a standalone fix. That is the work our On-Page SEO service covers.
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