Who this helps
- Writers organizing long articles
- Developers reviewing heading templates
Blog Utility
H1 / H2 Structure Checker
Enter blog post HTML to quickly check H1, H2, and H3 heading structure, hierarchy issues, empty headings, and duplicate H1 usage.
Heading Structure Analysis
Check the count and order of H1, H2, and H3 heading tags.
SEO Structure Check
Check duplicate H1 tags, missing headings, and skipped hierarchy.
Blog Quality Control
Review whether the post structure is easy for search engines and readers to understand.
Enter Body HTML
Paste your blog post body HTML to automatically analyze the heading tag structure.
0 chars
Enter HTML code and click the heading structure analysis button.
Analysis Result
Check heading tag counts and structure issues.
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H1 Count
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H2 Count
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H3 Count
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Needs Check
| No. | Tag | Heading Text | Status |
|---|---|---|---|
| The analysis result will appear here. | |||
Reviewing H1, H2 and H3 as a readable outline
Extract the first three heading levels from HTML and review empty headings, repeated H1 elements and missing section structure. The outline is a starting point for editorial and accessibility review.
When to use this tool
- Spot an H3 before any H2.
- Find headings that are empty or contain only whitespace.
From input to a checked result
- 1
Copy the final article HTML, including any title supplied by the template.
- 2
Paste up to 500,000 characters.
- 3
Run the check and read the outline in document order.
- 4
Compare warnings with the actual section relationships.
- 5
Recheck the revised page and inspect deeper levels separately.
A simple hierarchy
- Input
- <h1>Guide</h1><h2>Setup</h2><h3>Options</h3>
- Result
- An H1 → H2 → H3 outline
Use levels to express relationships, not just font size.
A missing section level
- Input
- <h1>Guide</h1><h3>Options</h3>
- Result
- An H3-before-H2 warning
Check whether a section heading is missing or the level was selected for appearance.
How it works
The parser lists H1, H2 and H3 in document order. It checks empty text, a first heading other than H1, absent or multiple H1 elements, missing H2 and H3 occurring before the first H2.
Limitations
- H4–H6, ARIA headings and text styled to look like headings are outside its scope.
- A missing H1 in a fragment may already be supplied by the full page template.
- Multiple H1 elements are a review signal, not a universal HTML validity verdict.
Your data
The supplied HTML is parsed in the browser and is not saved to the win-j server.
References
Related tools
- Title / Description Length Checker
Count a draft title and meta description, compare the wording in a simple search preview, and copy both fields. The colored ranges are this tool's writing aids; they do not measure Google rankings or predict the exact snippet.
- Image Alt Checker
List img elements and flag missing alt attributes, empty text, filename-like descriptions and very short labels. Decide the appropriate alternative from the image's purpose in its surrounding content.
Frequently asked questions
Does this inspect all six heading levels?
No. Review H4–H6 separately when the article has deeper nesting.
Must I change every warning?
Read it in context. A fragment may omit the surrounding page title or section headings.
Will this judge the quality of my headings?
It checks structure and empty text, not whether the headings accurately summarize the article.