Hreflang Tag Validator
Validate a page's hreflang tags: language/region codes, absolute URLs, x-default presence, and duplicates. Catch international SEO mistakes. Free.
Frequently asked
What is x-default for?
x-default tells Google which page to show users whose language/region doesn't match any of your hreflang entries. Most international setups should include one.
Do hreflang tags need to be reciprocal?
Yes — if page A points to B with hreflang, B must point back. This tool checks one page's tags; verify the return tags on each target too.