Free Developer Tool
Heading Structure Checker
Analyze heading levels and detect structural issues in text or HTML.
HTML
The checker analyzes H1–H6 elements and ignores other HTML elements.
Structure Score
98/100
Excellent
H1 - 1
H2 - 4
H3 - 4
H4 - 0
H5 - 0
H6 - 0
Heading Structure
H1How to Optimize Website Performance35 chars
H2Why Website Performance Matters31 chars
H2Core Web Vitals15 chars
H3Largest Contentful Paint24 chars
H3Cumulative Layout Shift23 chars
H2Image Optimization18 chars
H3Modern Image Formats20 chars
H3Responsive Images17 chars
H2Conclusion10 chars
Heading Details
H1How to Optimize Website Performance · Good length
H2Why Website Performance Matters · Good length
H2Core Web Vitals · Good length
H3Largest Contentful Paint · Good length
H3Cumulative Layout Shift · Good length
H2Image Optimization · Good length
H3Modern Image Formats · Good length
H3Responsive Images · Good length
H2Conclusion · Good length
Checks
infoThe document contains exactly one H1 heading.
What This Checks
• H1 presence and duplicate H1 headings
• H1–H6 hierarchy and skipped heading levels
• Empty headings
• Duplicate heading text
• Heading length
• Overall heading structure
What is Heading Structure Checker?
Analyze heading structure to understand the hierarchy of H1 through H6 headings and identify potential structural problems.
How to use
- Paste HTML or heading content.
- Analyze the heading structure.
- Review the heading hierarchy.
- Fix missing or inconsistent heading levels.
Features
- Heading hierarchy analysis
- H1-H6 detection
- Structure visualization
- Browser processing
Common Use Cases
- SEO audits
- Accessibility checks
- Content structure
- HTML development
Example
Input
<h1>CSS Guide</h1> <h2>Selectors</h2> <h3>Classes</h3> <h2>Layout</h2>
Output
H1: CSS Guide H2: Selectors H3: Classes H2: Layout Structure: Valid
FAQ
Does it support H1 through H6?
Yes.
Can it detect skipped heading levels?
Yes. The checker can identify potentially inconsistent jumps in heading hierarchy.
Is it useful for SEO?
Yes. A clear heading hierarchy can make page content easier for search engines and users to understand.
Missing a feature?
If this tool doesn't cover your use case or is missing functionality, please let me know through the Contact page.
New improvements and features are added based on user feedback.