Heading Structure Checker

Paste your page’s HTML to see its heading outline and catch structural problems like a missing H1 or skipped levels.

FreeNo sign-upRuns in your browserMobile-friendly

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What does the Heading Structure Checker do?

Headings give a page its structure. Screen-reader users jump between them, and search engines use them to understand topics. This checker extracts every H1–H6 tag from the HTML you paste and displays an indented outline.

It flags: no H1, more than one H1, a first heading that is not H1, skipped levels (H2 straight to H4), empty headings and very long headings. HTML is parsed with the browser’s DOMParser, which does not run scripts.

How to use the Heading Structure Checker

  1. Open your page, view its source (Ctrl+U) and copy all of it.
  2. Paste the HTML into the box.
  3. Review the outline and issues list.
  4. Fix the headings in your CMS and check again.

Examples

Skipped level

An H2 “Features” followed directly by an H4 “Fast” is flagged — change the H4 to H3.

Common use cases

  • On-page SEO audits
  • Accessibility reviews
  • Checking theme templates that misuse heading tags for styling

Features and benefits

  • Private by design — your data is processed on your device and never uploaded.
  • Free with no account, no watermark and no usage limits.
  • Works on phones, tablets and desktops in any modern browser.

Limitations to know

  • It checks the HTML you paste, not pages that build headings later with JavaScript.

Helpful guides

Frequently asked questions

Can a page have more than one H1?

HTML allows it, but one clear H1 describing the page is simpler for users and is the common best practice.

Do skipped heading levels hurt SEO?

Not dramatically, but a logical outline helps accessibility and makes topics clearer.

Is the HTML uploaded?

No, it is parsed in your browser.

Embed this tool on your website

Add the free Heading Structure Checker to your blog or website. Paste the code into your page’s HTML; the tool runs in your visitors’ browsers and stays up to date automatically. Please keep the credit line below the tool.

Free to use on any website. The tool runs inside an iframe served from viptools.pk; nothing your visitors type is sent to your site or ours. Preview the embedded version.

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