Check the hreflang annotations on any page. See every language/region version, confirm the page references itself, catch invalid codes (en-UK, en_US) and a missing x-default — the mistakes that break international SEO and send users to the wrong version.
What is hreflang and when do I need it?
hreflang tells Google which language or country version of a page to show which users. You need it only if you serve the same content in multiple languages or target multiple countries — a single-language site doesn't.
What are the most common hreflang mistakes?
Missing self-reference (each page must list an hreflang pointing to itself), a missing x-default fallback, invalid codes (en-UK instead of en-GB, or en_US with an underscore), relative URLs, and non-reciprocal tags (the alternate pages don't link back).
What does x-default do?
x-default is the fallback version Google shows to users whose language/region doesn't match any of your listed versions — usually your main or language-selector page. This tool flags it when missing.
Does this check reciprocity?
It validates one page's tags (self-reference, codes, x-default). Full reciprocity means every alternate must link back to the whole set — check the alternates too. This tool gives you the per-page validation in seconds.
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