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SEO and auditingChecked through WebDiag API

Heading Structure Checker

Enter a page URL to check the full heading structure. H1 is treated as one subcheck, not as a weak standalone tool.

  • H1–H6 outline
  • Skipped levels
  • Static HTML
Online tool

Try the tool

Enter a URL: WebDiag will run a safe network check and show the result.

Network check through backend

For HTTP/SEO tools, the URL is sent to the WebDiag API, where SSRF protection, DNS/IP policy, and redirect limits are applied.

Reviewed: 2026-07-17
01

How to use it

  1. 1

    Paste a public page URL.

  2. 2

    WebDiag loads the HTML and extracts h1–h6 headings.

  3. 3

    Review H1, hierarchy, empty headings, and recommendations.

02

What the tool can do

  • Shows the full page outline, not just one H1.
  • Flags skipped levels such as H1 → H3.
  • Uses safe backend fetching with SSRF protection.
03

Common use cases

  • Check landing-page SEO structure before release.
  • Find empty or skipped headings in a CMS template.
  • Prepare content fixes for UX, SEO, and accessibility.
04

How it works inside

H1 is not a separate microtool; it is one check inside an aggregate outline tool.

The result is limited to one page and static HTML.

05

Questions and answers

Why is there no separate H1 checker?

Because H1 alone is too thin for a standalone tool. It is checked inside the full H1–H6 structure.

Is this an accessibility audit?

No. This is a content/SEO outline tool. Accessibility heading checks should later be part of a dedicated accessibility audit.