BCP 47 Validator

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This service lets you validate language tags such as de-CH or en-US according to BCP 47 (formerly RFC 4646) and the IANA Language Subtag Registry. The Language Tag Extensions Registry is not used by this service, but this may change in the future.

Separate multiple tags by comma or whitespace. Do not include quality values such as ;q=0.8. As you type, the background color denotes whether all tags are well-formed and valid, any tag is invalid or any tag is not well-formed.

Language tags:
Output format:
Input
en-US-ABC
Canonical
Input is canonical
False
Well-formed
False
Valid
False
Registry date
2024-11-19
Primary language subtag
–
Extended language subtags
–
Script subtag
–
Region subtag
–
Variant subtags
–
Extension subtags
–
Private subtags
–
Messages
–

Feedback

Don't hesitate to send suggestions and comments to Christoph Schneegans (christoph@schneegans.de).

Contact: Christoph Schneegans (christoph@schneegans.de)