methodology / SEO & Discoverability / #42

hreflang for multi-language sites

live factor #42 · SEO & Discoverability · scoring impl: implemented · weight 0.7%

What we measure

If your site serves multiple languages or regions, hreflang tells Google which version to show whom. Without it, Google guesses and often gets it wrong.

How to improve your score

Add `<link rel="alternate" hreflang="...">` tags pointing at each language version, including a self-reference and an `x-default` fallback.

Data source

Data source for this factor is not yet documented.

Implementation notes

Detect alternate hreflang links in the head and HTTP headers; flag missing or asymmetric pairs.

Scoring

Scoring formulas are versioned with the methodology. The current method (v1.1.0) maps raw measurements to pass, warn, fail. Factor weights determine how much each contributes to the composite — see the methodology index for the full table.

Version history

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