Web & SEO
Heading Structure Checker
Extract H1-H6 headings and flag skipped hierarchy levels.
Free foreverRuns in your browserNo sign-up
Headings
0
Level skips
0
About the Heading Structure Checker
Heading Structure Checker displays the H1-H6 outline from pasted HTML and flags upward jumps such as H2 directly to H4.
A clear hierarchy helps readers and assistive technology understand page sections; visual size alone should be handled with CSS.
Key features
- H1-H6 extraction
- Indented document outline
- Skipped-level detection
- Empty heading visibility
How to use
- 1Paste the page HTML.
- 2Review the ordered heading outline.
- 3Use one descriptive page H1 and repair unexplained hierarchy skips.
Examples
Use the Heading Structure Checker
Input:
H1 followed by H2 and H3Output:
Three headings and zero level skipsDo not choose heading levels for visual size.
Frequently asked questions
- Must there be only one H1?
- A single clear page H1 is a practical convention for most content pages.
- Are skipped levels always invalid HTML?
- Not necessarily, but they often make structure harder to understand.
- Is my data uploaded?
- No. Analysis and generation happen entirely in your browser.