Heading Structure Helper
Paste HTML or plain text and instantly see a visual map of your heading hierarchy with accessibility and SEO issue warnings.
Use the Heading Structure Helper
Paste HTML or Text
Paste your full HTML source, a snippet, or plain text below.
0
Total Headings
0
Levels Used
0
Issues Found
Paste your HTML or text on the left and click Analyze Headings.
Issues Detected
No issues found
Heading hierarchy looks correct.
Heading Outline
Summary
The Heading Structure Helper parses any HTML snippet or page source and extracts all H1–H6 tags into an indented visual outline. It then checks the outline against accessibility rules — exactly one H1, no skipped levels, logical nesting — and lists issues with plain-language explanations. Use it before publishing to catch structural problems that affect screen reader navigation and search engine ranking.
How it works
- Paste your HTML source or plain text into the input box.
- Click "Analyze Headings" to parse heading tags (H1–H6).
- A visual tree shows each heading indented by its level.
- Issue badges flag missing H1, skipped heading levels, or multiple H1s.
- Fix any flagged issues and re-analyze to confirm compliance.
Use cases
- Audit blog posts or landing pages for proper heading hierarchy.
- Check CMS-generated content for heading accessibility compliance.
- Verify documents meet WCAG 2.1 heading order requirements.
- Debug SEO issues caused by missing or duplicate H1 tags.
- Review student or client HTML submissions for structure correctness.
- Ensure heading levels are not skipped (e.g., H1 jumping to H3).
Frequently Asked Questions
Last updated: 2026-06-11 · Reviewed by Nham Vu