Broken heading hierarchy: when your H1, H2, H3 skip levels

In brief

A broken heading hierarchy skips levels (for example H1 then H3 with no H2): the direct SEO impact is low, it is mostly hygiene. A clean structure helps Google and LLMs split the page into sections and screen readers navigate.

InfoP3 — Quality

What is it?

The heading hierarchy skips levels (e.g. H1 to H3 without an H2).

Why it hurts SEO and AI

Honestly: the direct SEO impact is low. But a clean heading structure helps Google split the page into sections, LLMs extract answers, and screen readers navigate. It is hygiene at near-zero cost.

When it is NOT a problem

  • The page has a single H1 followed by H2s, with no skipped level: the hierarchy is already correct.
  • The skip comes from a third-party, non-indexable component (widget, iframe) outside your main content.
  • You are on the very first crawl of the page: Seogard does not alert until it has a baseline.
Before
<h1>Trail running guide</h1>
<h3>Choosing your shoes</h3>
<h3>Staying hydrated</h3>
After
<h1>Trail running guide</h1>
<h2>Choosing your shoes</h2>
<h2>Staying hydrated</h2>

On the left, it jumps from H1 to H3 with no H2; on the right, each section is an H2, giving a tree that machines can read.

How to fix it

  1. List the page headings in order (a heading-structure extension is enough) and spot the skipped levels.
  2. Fix the tags in the template so no level is skipped (H1 then H2 then H3).
  3. Check that there is only one H1 per page.
  4. Re-crawl the page to confirm the hierarchy is consistent.

This scan checks the content structure: H1, headings and text volume

Is this issue on your site?

Do your headings skip levels on some pages? Enter a URL: Seogard analyzes the heading structure of the rendered HTML and shows you where the hierarchy breaks. Free, no credit card.

By clicking Scan, I certify that I own this site or have permission to crawl it.

  • No credit card
  • Result in ~30 s

What you get back

Clean extraction by machines and better accessibility, for a few minutes of work.

Seogard catches this regression automatically — through its continuous SEO monitoring.

Frequently asked questions

Does an H1 followed by an H3 hurt SEO?

There is no penalty. The direct ranking impact is low, but a clean structure helps Google and LLMs understand the page outline and improves accessibility.

Should there be a single H1 per page?

One clear H1 remains best practice: it states the main topic. Multiple H1s are not fatal but blur how the page is segmented.

Related rules

Lang attribute removedThe HTML lang attribute is gone. Google may misidentify the page language. Lang attribute changedThe lang attribute changed (e.g. fr to en). Can break language targeting if accidental. Content length changedThe word count changed by 30 to 50%. Notable change but not catastrophic — worth checking.

Updated July 10, 2026