Heading Structure Checker

Paste HTML and visualize the H1–H6 heading hierarchy. Flags missing H1, duplicate H1, and skipped levels.

Heading Structure Checker

Paste any HTML page source to visualize its heading hierarchy (H1–H6) as an indented tree. The checker flags common SEO and accessibility issues.

  • Missing H1 – every page should have exactly one H1
  • Multiple H1s – only one H1 per page recommended
  • Level skips – e.g. H2 followed by H4 with no H3 in between
  • Empty headings – headings with no text content