Heading Structure Checker

Paste HTML below to analyze the heading hierarchy (H1-H6). Identifies missing H1, skipped levels, and duplicate headings.

How to Use Heading Checker

  1. Enter the URL or data you want to check.
  2. Click the Check/Test button to analyze.
  3. Review the results and recommendations.

All processing happens locally in your browser. Your data is never uploaded to any server.

Frequently Asked Questions

Is Heading Checker free to use?

Yes, completely free. No signup, no limits. All processing happens in your browser — your data never leaves your device.

Does Heading Checker work on mobile?

Yes, it works on all devices including phones and tablets. The interface is fully responsive.

Is my data safe?

Absolutely. Everything runs locally in your browser using JavaScript. No data is uploaded to any server.