For international SEO, the `hreflang` tag is your way of giving search engines a clear map to the correct language and regional versions of your content. However, this map becomes useless if it contains contradictory directions. A critical error is having multiple hreflang entries for the same language-region code on a single page. This tells a search engine that two different URLs are the correct version for the same audience, a conflicting signal that often results in Google ignoring the instruction altogether.

Think of it like telling a GPS two different addresses for the same destination. Instead of picking one at random, the system will likely return an error. Similarly, when Google encounters multiple hreflang tags for ‘en-US’, it can’t determine the single authoritative page. This undermines your entire localization strategy and can lead to the wrong page ranking in the wrong country.

An illustration of two conflicting signposts for the same destination, symbolizing the confusion from multiple hreflang entries.

One Language, One Signal: The Rule of Hreflang Uniqueness

The fundamental rule of hreflang is one unique URL for one unique language or language-region target. If your page has annotations for English in the US, Spanish in Mexico, and French in Canada, each of those must be a distinct, single entry. The problem arises when the code is duplicated, like this:

Example: Fixing a Duplicate Entry

<!-- Before: Two entries for 'es-ES' --> <link rel="alternate" hreflang="es-ES" href="https://example.com/es/pagina-a/" /> <link rel="alternate" hreflang="es-ES" href="https://example.com/es/pagina-b/" /> <!-- After: The incorrect entry is removed --> <link rel="alternate" hreflang="es-ES" href="https://example.com/es/pagina-a/" />

For more on this topic, see our guide on on-page SEO. For a deep dive into hreflang, this guide from Ahrefs is an excellent resource.

Frequently Asked Questions

Can I have hreflang=’en-US’ and hreflang=’en-CA’ on the same page?

Yes, absolutely. This is a correct implementation because the language-region codes (‘en-US’ and ‘en-CA’) are unique. The problem of multiple entries arises when you declare the exact same code, like ‘en-US’, two or more times on the same page, pointing to different URLs.

Can I have multiple ‘x-default’ entries?

No. Just like any other hreflang value, the `x-default` value must be unique. You can only have one `x-default` tag per page to specify a single fallback URL.

Could this error happen in an XML sitemap too?

Yes, the same principle applies to hreflang annotations in an XML sitemap. A entry should not contain multiple elements with the same ‘rel’ and ‘hreflang’ attributes. Search engines will see this as a conflicting signal, just as they would in an HTML .

Are you sending conflicting signals? Start your Creeper audit today and ensure your hreflang implementation is flawless.