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Heading Hierarchy Validator — Free, No Upload, Browser-Based

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Paste HTML or Markdown and instantly see a visual outline of your h1–h6 heading hierarchy, with plain-English issue reports for skipped levels and multiple h1 tags. Good heading structure matters for both screen-reader accessibility and SEO — this tool catches the most common mistakes before they ship. Everything runs in your browser: no upload, no account, and your markup is never sent anywhere.

Como usar esta ferramenta

  1. Selecione HTML ou Markdown como formato de entrada e cole o seu conteúdo na área de texto.
  2. A ferramenta analisa todos os cabeçalhos h1–h6 e verifica níveis ignorados ou múltiplas tags h1.
  3. Reveja o contorno visual e corrija quaisquer problemas sinalizados na fonte antes de publicar.
Input format

1 issue found

  • line 6h4 follows h2 — skips level h3.

Outline (6 headings)

  • h1Page Title:1
  • h2Section A:2
  • h3Subsection A1:3
  • h4Detail:4
  • h2Section B:5
  • h4Skipped h3!:6
h1×1h2×2h3×1h4×2
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Heading Hierarchy Validator — Free, No Upload, Browser-Based | brevio