Heading Hierarchy Checker
// Check HTML heading structure for proper nesting
#About Heading Hierarchy Checker
Free online heading hierarchy checker. Paste HTML and validate that h1-h6 headings follow proper nesting order for accessibility and SEO best practices. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
#FAQ
Why does heading hierarchy matter for accessibility? ▾
Screen reader users often navigate pages by headings. A logical heading hierarchy (h1 followed by h2, then h3, etc.) creates a clear document outline that allows users to understand page structure and jump to relevant sections efficiently.
Can I have multiple h1 elements on a page? ▾
While HTML5 technically allows multiple h1 elements in sectioning content, it is best practice to use a single h1 per page for clarity. Multiple h1 elements can confuse screen readers and dilute SEO focus.
</> Embed this tool ▾
Copy this code to embed the tool on your website. Adjust the height to fit your layout.
<iframe src="https://www.browserutils.dev/embed/heading-hierarchy-checker" width="100%" height="500" frameborder="0" title="Heading Hierarchy Checker"></iframe>