Developer Tools
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.
Sådan bruger du dette værktøj
- Vælg HTML eller Markdown som inputformat, og indsæt derefter dit indhold i tekstområdet.
- Værktøjet analyserer alle h1–h6-overskrifter og kontrollerer for hoppede niveauer eller flere h1-tags.
- Gennemgå den visuelle oversigt, og ret eventuelle markerede problemer i din kilde, inden du publicerer.
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