: What is the SEO effect of one URL serving both English and French content? I am working on a website which caters to both English and French users. Client is currently serving both the French

@Heady270

Googlebot only recently started crawling with an Accept-Language header that would even allow Google to index the same URL under two different languages.

Even now that Googlebot can crawl both languages correctly, I don't know of any site that has been successfully indexed that way in both languages. Google has a help document about this crawling mechanism with a big red recommendation at the top of the page:


IMPORTANT: We continue to support and recommend using separate locale URL configurations and annotating them with rel=alternate hreflang annotations.


At this point, I would consider using a single URL "experimental" and "not well supported". See How should I structure my URLs for both SEO and localization? for information about the best ways to make different URLs for different languages.

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@Berumen354

Strictly speaking there is no issue with doing it this way and many sites do it the same way as you and define the language based on cookies and not URL however best practice, and the way that Google recommends, is to use either a directory structure or a sub-directory option.

IE:
www.domain.com/en/page.html en.domain.com/page.html
And on each page you use the alt hreflang tags to define the addresses for the translated pages. This part is important so that you don't get penalised for duplicate content and it also helps Google identify the right version of the page to serve to the end user based on their preferred language.

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