← ← All Tools
中文

🧭 Heading Outline Checker

Analyze pasted HTML or Markdown heading structure locally, build an outline, and flag hierarchy issues.

Pasted Source

Analyze HTML or Markdown text in this browser only.

Initial

Input Mode

No upload, URL fetch, or external API.

Structure Summary

Waiting for input.

Headings 0
H1 0
Deepest -
Issues 0

Local Checks

These are structure checks, not ranking, indexing, or WCAG compliance proof.

  • Local heading checks appear after you enter source text.

Outline Results

Generated from explicit heading markup; this does not reconstruct a browser document outline algorithm.

No headings yet.

Copy Output

Export the current local analysis; the tool does not save your source text.

Output preview will appear here.

More tools you might find useful.

📊
Keyword Density Checker
Analyze keyword frequency, percentage share, and repeated terms in articles, titles, product copy, and SEO drafts before publishing or editing.
🔎
SERP Snippet Preview
Preview title, description, and URL as an approximate search-result snippet before publishing.
⠿
Braille Translator
Translate between plain text and 6-dot Unicode braille with ASCII braille, dot notation, and character lookup
🔤
Case Converter
Local workbench for text case conversion, title case, and URL slug generation.
📈
Character Frequency Counter
Count character, letter, or word frequency with percentage, sorting, filters, and Shannon entropy

Heading Outline Checker analyzes pasted HTML or Markdown locally in your browser. It extracts H1-H6 and ARIA headings, builds an outline tree and table, summarizes heading depth, and flags local structure issues such as missing H1, multiple H1s, empty headings, skipped downward levels, duplicate text, and suspicious labels. It is useful before publishing articles, docs, and page fragments, but it does not fetch URLs, audit entire sites, or promise SEO ranking, indexing, or WCAG compliance.