For some languages, it is sometimes useful to distinguish between variants spoken in different countries, e.g. when you want to distinguish speech synthesis for Belgian Dutch or Dutch from the Netherlands. What you'll need initially is just the list of ISO 639-1 language tags (two-letter codes), since the biggest languages are all represented
ISO 639 provides three language codes for the representation of names of languages: one is a two-letter code and two others are three-letter codes (ISO 639-2 and ISO 639-3). ISO 639-1 was devised primarily for use in terminology, lexicography and linguistics.
All three-character language subtags were defined in the IANA registry according to the assignments found in ISO 639 Part 2, "ISO 639-2:1998 - Codes for the representation of names of languages -- Part 2: Alpha-3 code - edition 1" , or assignments subsequently made by the ISO 639 Part 2 maintenance agency or governing standardization bodies. 3.
ISO 639-2:1998 provides two sets of three-letter alphabetic codes for the representation of names of languages, one for terminology applications and the other for bibliographic applications. The code sets are the same except for twenty-five languages that have variant language codes because of the criteria used for formulating them.
There are a number of suggestions for deciding whether to use a one-level (language only) or two-level (language-region) tag. They require some discussion and will be added here shortly. Language codes used as primary subtags are from ISO 639. Country codes used as secondary subtags (or tertiary if script tags are secondary) are from ISO 3166.
You can’t simply use random two-letter combinations that suit your fancy! While you can use hreflang language codes on their own, it’s best to use them together with the ISO 3166-1 alpha-2 hreflang regional codes. This helps give search engines a full picture of which language and geographical region a particular web page is meant for.
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iso language codes 2 letter