If you have a site in multiple languages, hreflang tells engines which version to show whom. Done wrong, it confuses indexing.
What you enter
A URL.
What you get
- A score (0-100) on hreflang correctness.
- The list of declared alternate versions, with each one's status:
- correct (reachable and reciprocal),
- orphaned (doesn't point back),
- unreachable.
- Syntax warnings (e.g. invalid language-region codes like
en-US).
How to use it well
It's mainly for sites in multiple languages or countries. The most common problem is missing reciprocity: if the EN page points to the FR one, the FR page must point back to the EN one. The tool highlights this for you.
You don't need it if…
You have a single-language site: in that case hreflang doesn't apply.
What is hreflang?
It's a tag that tells search engines which language or regional version of a page to show each user. It's only relevant for multilingual or multi-country sites.