Heading structure matters for SEO and accessibility, but it's hard to see in the browser. The Heading Hierarchy Map bookmarklet shows it as a visual tree.
One click generates a diagram of every heading on the page, color-coded by level from H1 (red) to H6 (purple). Click any heading in the tree to jump to it on the page.
What It Shows #
- Color-coded heading levels
- Nesting relationships via indentation
- Child and leaf node badges
- Total heading count
- Click-to-navigate from the diagram
Why It Matters #
SEO: Search engines use headings to understand content hierarchy. One H1 per page, proper nesting, no skipped levels.
Accessibility: Screen readers use headings for navigation. Broken structure breaks the experience.
Content quality: Good headings reflect organized thinking. They make content scannable.
When to Use It #
- SEO audits of competitor pages
- Accessibility reviews
- Content planning and restructuring
- Verifying CMS-generated heading markup
Drag me to bookmark bar: 👉🏻 Heading Map
- Previous: AI Summarizer Bookmarklet
- Next: Best Bookmarklets for Developers