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.
Enter Body HTML
Paste your blog post body HTML to automatically analyze the heading tag structure.
Analysis Result
Check heading tag counts and structure issues.
| No. | Tag | Heading Text | Status |
|---|---|---|---|
| The analysis result will appear here. | |||
Help
What is an H1 / H2 Structure Checker?
The H1 / H2 Structure Checker is a free blog utility that analyzes heading tag structure in blog post HTML. It helps you check whether the main title, section headings, and subheadings are arranged in a logical order.
Supported Features
- Check the number of H1, H2, and H3 heading tags
- Detect duplicate H1 headings
- Detect empty heading tags
- Check whether H3 appears before any H2
- Display heading structure in a table
- Copy analysis result
Useful For
- Checking heading structure before publishing blog posts
- Reviewing SEO content structure
- Managing content quality for AdSense approval
- Checking HTML from Tistory, WordPress, and personal blogs
- Finding missing subheadings in body content
How many H1 tags should a page have?
In general, it is easier to manage a page when it has only one H1 that represents the main title. Reusing H1 inside the blog body can make the main topic of the page less clear.
How should H2 and H3 be structured?
Use H2 headings for major sections of the article and H3 headings for details within each H2 section. Starting with H3 without an H2 can make the heading hierarchy feel unnatural.
Notice
This tool checks HTML heading tag structure. Actual SEO evaluation also depends on content quality, search intent, site trust, user experience, and many other factors.