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 yet.
Enter one language tag per line. When JavaScript is enabled, the background color denotes whether all tags are well-formed and valid, any tag is invalid or any tag is not well-formed.
Don't hesitate to send suggestions and comments to Christoph Schneegans (Christoph@Schneegans.de).