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
mn-Cyrl-MN
Canonical
mn-Cyrl-MN
Input is canonical
True
Well-formed
True
Valid
True
Registry date
2024-03-07
Primary language subtag
mn – Mongolian
Extended language subtags
–
Script subtag
Cyrl – Cyrillic
Region subtag
MN – Mongolia
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)