Heading Hierarchy Validator
Validate heading nesting.
Validate heading hierarchy instantly. Free H1-H6 checker for correct nesting and single H1.
Calculator Inputs
About Heading Hierarchy
Validate heading nesting.
Checks H1 count and hierarchy.
Where it is used
SEO and accessibility.
How to use the Heading Hierarchy
- HTML Source — enter the value (e.g. <h1>Title</h1><h2>Section</h2>).
- Calculate — press the Calculate button to see the result instantly above.
Formula
Parse H1-H6, check single H1 and no level skips.
Examples
Example
html:<h1>Title</h1><h3>Sub</h3>
Result: Jump H1 to H3
Frequently Asked Questions
- Multiple H1?
- One per page is best practice.