Heading Structure Checker
Free online heading structure checker that runs entirely in your browser.
How the Heading Structure Checker works
The Heading Structure Checker works on Paste page HTML and shows the result as you type. The same input always gives the same answer — refresh the page and you will see exactly the same figure.
Formula used
Heading Structure Checker is computed by the formula below, using the inputs you provide.
Inputs used: Paste page HTML.
Worked example
Take the default example — paste page html of <h1>Welcome</h1><h2>Section</h2><p>text</p>:
- h1: 1
- h2: 1
- h3: 0
- h1Length: 7
Frequently asked questions
- Is the Heading Structure Checker free?
- Yes. There is no signup, no usage limit and no watermark — the checker runs entirely in your browser.
- Does the Heading Structure Checker store or send my data?
- No. Every calculation happens locally in the page, so the numbers you type are never uploaded or logged.
- Does it work on a phone and offline?
- Yes — the page is a single lightweight file that adapts to any screen size. Once it has loaded it keeps working without a network connection.
- What inputs does the Heading Structure Checker need?
- Paste page HTML. Change any of them and the result updates instantly.