Validation

H1 Checker

Detects if a page has a unique H1, if it is empty, or if it appears duplicated within the main content.

Check if the page has a single H1 heading and if its content is optimal for SEO.

The H1 is the main title of the page. There should only be one per URL.

Enter a URL to start.

INFO

WHAT DOES THE H1 CHECKER CHECK?

This tool locates H1 tags within the HTML and checks whether a recognizable main heading exists.

A single H1 helps users, search engines, and AI systems understand the main intent of the page without ambiguity.

Single H1:
Detects whether there are zero, one, or multiple H1s.
Useful text:
Flags if the H1 is empty or contains too little meaningful text.
Basic consistency:
Allows comparison of the H1 with an expected title.
Quick reading:
Summarizes the status in a simple, copyable report.

Common questions about the visible main heading.

Should there always be an H1?

In an indexable page with original content, yes. It is a basic signal for identifying the main topic.

Is having multiple H1s serious?

Not always a critical issue, but it reduces structural clarity. AISEO prefers a single, unambiguous H1.

Should the H1 match the title?

Not necessarily. They should be aligned, but the title works as metadata while the H1 is the visible heading of the content.