Error · Hreflang

Invalid hreflang language code

Why it matters

Language codes must be ISO 639-1, optionally with an ISO 3166-1 region (en, en-GB).

How to fix it

Correct the code (for example 'en-UK' is invalid; use 'en-GB').

How Crawlune finds it

Crawlune flags Invalid hreflang language code automatically on every crawl and lists the affected URLs under theHreflang tab, where you can filter, inspect each page and export the list to CSV. The free version crawls up to 500 URLs with every check enabled.