Should you really implement hreflang between distant languages?

Why does Google consider hreflang unnecessary between very different languages?

The logic behind this statement is simple: Google's algorithm automatically detects the language of a page and matches it with the language of the query. When a user searches in Japanese, the engine will not show them a Swedish page, even without hreflang.

This detection relies on several signals: analysis of textual content, HTML lang tag, IP geolocation, browser language settings. For languages with different alphabets (Latin, Kanji, Hangul), the distinction is clear and does not require additional annotation.

In what cases is hreflang still essential?

Mueller points out two situations where the attribute remains highly useful. First situation: closely related languages that share lexical similarities — Spanish/Portuguese, Danish/Norwegian, Serbian/Croatian. Here, Google may hesitate without explicit indication.

Second case: international brands with identical search terms across several countries. A user typing 'Nike Air Max' could be in France, Belgium, or Canada. Without hreflang, Google may show the wrong local version, with incorrect prices, wrong currency, or out-of-stock items.

What does this mean for the technical maintenance of a multilingual site?

If your site offers content in radically different languages (Japanese, Arabic, Russian, Finnish), you can theoretically save development and validation time. There is no need to generate and maintain dozens of hreflang tags between these versions.

However, be cautious: this simplification does not exempt you from properly implementing hreflang where it is necessary. A poorly configured hreflang can cause more damage than a total absence — Google often ignores it when it detects errors in the structure.

• Hreflang is unnecessary between languages with very different alphabets (e.g., Swedish ↔ Japanese)
• The attribute remains critical for closely related languages (es-ES ↔ pt-PT) or global brands
• Google's automatic language detection relies on several signals (content, lang tag, geolocation)
• Simplifying hreflang for distant languages reduces technical debt without SEO risk
• A partial implementation is better than widespread erroneous implementation

Is this statement consistent with real-world observations?

Yes, and it's even a welcome confirmation of an already observed practice. In audits of international e-commerce sites, linguistically distant versions perform well without hreflang between them. A site with Japanese, Finnish, and Arabic has never shown issues of cannibalization between these versions.

On the other hand, problematic cases consistently arise regarding closely related language pairs: en-GB vs en-US, fr-FR vs fr-CA, es-ES vs es-MX. Without hreflang, Google frequently mixes these versions in local SERPs, especially when the content is nearly identical.

What nuances should be considered regarding this general rule?

First nuance: the definition of 'significantly different languages' remains vague. Where do we draw the line? Czech and Slovak are mutually intelligible — should hreflang be applied or not? Google does not provide an exhaustive list. [To verify] on a case-by-case basis according to your Search Console data.

Second point: even between distant languages, some cross-cutting content may share queries. A technical article with a lot of English terminology published in Swedish and Japanese could theoretically create ambiguity on international technical queries.

In what contexts could this recommendation pose problems?

Sites with multilingual content on the same domain (example.com/sv/, example.com/ja/, example.com/ko/) still benefit from a complete hreflang structure to clearly signal the architecture to Google. It helps the algorithm understand the logic of the site, even if it's not strictly necessary.

Another edge case: brands with strong international recognition. If your brand is searched under the same name in Swedish and Japanese, hreflang helps route users to the right local version even if the languages are distant. This is exactly the second use case mentioned by Mueller.

What should be done concretely on an existing multilingual site?

First step: audit your current hreflang matrix. List all declared language pairs and identify those that are radically different (distinct alphabets, linguistic families without kinship). You can technically remove them from your configuration without SEO risk.

Let’s be honest: if your current hreflang is functioning correctly, there is no urgency to simplify it. Google ignores what is superfluous, so keeping annotations between Japanese and Swedish does not penalize you. The interest is mainly to reduce complexity for future maintenance and changes.

How to prioritize hreflang implementation on a new project?

During a multilingual launch, start by implementing hreflang only on critical pairs: geographically or linguistically close languages, regional versions of the same language (en-US/en-GB/en-AU), markets where you have strong local competitors.

Specifically? A site with French, German, Polish, Japanese, and Korean should prioritize fr-FR ↔ fr-BE ↔ fr-CH if these versions exist, and then possibly de-DE ↔ de-AT ↔ de-CH. Relationships like FR ↔ JA or PL ↔ KO can wait or be definitively omitted.

What mistakes should be avoided in this optimization?

Do not confuse simplicity and negligence. Removing hreflang between distant languages? Okay. But this does not exempt you from checking that each language version has its correct HTML lang tag, its truly translated content (not Google Translate), and its coherent server geolocation if relevant.

Another trap: over-simplifying on sites with complex geographical targeting. If you have /ja/ for Japan and /ja-sg/ for Singapore (Japanese-speaking market in Southeast Asia), hreflang remains relevant even if it's the same language, as the commercial intention differs.

• Audit the current hreflang matrix and identify distant language pairs
• Check in Search Console for the absence of cannibalization between linguistically distinct versions
• Prioritize implementation for closely related languages and regional versions of the same language
• Maintain the HTML lang tag on all pages, regardless of hreflang
• Monitor impressions/clicks by country for 4-6 weeks after any changes
• Document the logic of your hreflang matrix for future site developments