Heading Structure Checker

Paste any HTML below to see your heading hierarchy as an indented tree. Issues like multiple H1s, skipped levels, and empty headings are flagged automatically.

HTML Input

Runs entirely in your browser. Nothing is uploaded.

How it works

STEP 1

Paste your HTML

Copy the source of any page or snippet and paste it into the input field.

STEP 2

Analyze

Click Check Structure to parse all heading tags and build a visual hierarchy tree.

STEP 3

Review issues

See flagged problems — multiple H1s, skipped levels, or empty headings — highlighted inline.