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Please note that Hebrew, Thai and Vietnamese have not been added to the /languages endpoint as they are only available in the text translation API using next-gen models. When these languages are available for all translation endpoints (including document translation) they will be added to the /languages endpoint and this note will be removed.
If trying to convert between variants of the same language (e.g. EN-US to EN-GB), please use the /write/rephrase API.

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Translation source languages

  • AR - Arabic
  • BG - Bulgarian
  • CS - Czech
  • DA - Danish
  • DE - German
  • EL - Greek
  • EN - English (all English variants)
  • ES - Spanish (all Spanish variants)
  • ET - Estonian
  • FI - Finnish
  • FR - French
  • HE - Hebrew (text translation via next-gen models only)
  • HU - Hungarian
  • ID - Indonesian
  • IT - Italian
  • JA - Japanese
  • KO - Korean
  • LT - Lithuanian
  • LV - Latvian
  • NB - Norwegian Bokmål
  • NL - Dutch
  • PL - Polish
  • PT - Portuguese (all Portuguese variants)
  • RO - Romanian
  • RU - Russian
  • SK - Slovak
  • SL - Slovenian
  • SV - Swedish
  • TH - Thai (text translation via next-gen models only)
  • TR - Turkish
  • UK - Ukrainian
  • VI - Vietnamese (text translation via next-gen models only)
  • ZH - Chinese (all Chinese variants)

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Translation target languages

  • AR - Arabic
  • BG - Bulgarian
  • CS - Czech
  • DA - Danish
  • DE - German
  • EL - Greek
  • EN - English (unspecified variant for backward compatibility; we recommend usingEN-GB or EN-US instead)
  • EN-GB - English (British)
  • EN-US - English (American)
  • ES - Spanish
  • ES-419 - Spanish (Latin American)
  • ET - Estonian
  • FI - Finnish
  • FR - French
  • HE - Hebrew (text translation via next-gen models only)
  • HU - Hungarian
  • ID - Indonesian
  • IT - Italian
  • JA - Japanese
  • KO - Korean
  • LT - Lithuanian
  • LV - Latvian
  • NB - Norwegian Bokmål
  • NL - Dutch
  • PL - Polish
  • PT - Portuguese (unspecified variant for backward compatibility; we recommend using PT-BR or PT-PT instead)
  • PT-BR - Portuguese (Brazilian)
  • PT-PT - Portuguese (all Portuguese variants excluding Brazilian Portuguese)
  • RO - Romanian
  • RU - Russian
  • SK - Slovak
  • SL - Slovenian
  • SV - Swedish
  • TH - Thai (text translation via next-gen models only)
  • TR - Turkish
  • UK - Ukrainian
  • VI - Vietnamese (text translation via next-gen models only)
  • ZH - Chinese (unspecified variant for backward compatibility; we recommend using ZH-HANS or ZH-HANT instead)
  • ZH-HANS - Chinese (simplified)
  • ZH-HANT - Chinese (traditional)
As of April 2025, supported languages for text improvement (DeepL API for Write) have not yet been added to the /languages endpoint; we’ll be extending the /languages endpoint in the near future to include this information.

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Text improvement languages (DeepL API for Write)

  • DE (German)
  • EN-GB (British English)
  • EN-US (American English)
  • ES (Spanish)
  • FR (French)
  • IT (Italian)
  • PT-BR (Brazilian Portuguese)
  • PT-PT (Portuguese)
For the /write/rephase endpoint, writing_style and tone currently work in DE, EN-GB, and EN-US.