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Heading Structure Checker

See a page's headings as an outline and spot problems.

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  • No Sign Up
  • Works in Your Browser

Heading structure checker

Outline H1 to H6 headings and spot gaps

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How to use the heading structure checker

Three steps, all in your browser.

  1. 1

    Paste the source

    Copy the page's HTML from View Source and paste it in.

  2. 2

    Read the report

    Counts, scores and warnings update as soon as you paste.

  3. 3

    Copy the result

    Copy what you need in one click. Nothing is saved or sent anywhere.

Heading Structure Checker: what to know

Headings, h1 to h6, give a page its outline: the h1 names the page, h2s mark the main sections, and lower levels mark subsections. The heading structure checker reads a page's HTML and shows its headings as an indented outline, flagging a missing h1, more than one h1, skipped levels such as an h2 followed by an h4, and empty headings.

Search engines use headings to understand what each part of a page covers, and screen-reader users jump between headings to navigate, so a clear outline helps both. Google has said that multiple h1 elements are fine for search, and heading order isn't a ranking factor in itself. The checker flags those patterns because they often point to a template problem, such as the logo marked up as an h1 on every page.

Headings should describe the content below them in plain words, not be chosen for their font size. If a design needs large text that isn't a section heading, style a paragraph instead. Paste the rendered HTML, from the browser's developer tools, if your headings are added by JavaScript.

Popular uses

  • Auditing a page's outline before publishing
  • Finding templates that wrap logos or widgets in headings
  • Checking accessibility of long articles
  • Comparing heading structure with competing pages

Tips for the best result

  • Make the h1 match the page's topic and title in meaning.
  • Use headings that would work as a table of contents.
  • Don't skip from h2 to h4 just to get smaller text; use CSS for size.

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Frequently asked questions