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The DeepL API supports the following languages. These can also be retrieved programmatically via the /languages endpoint.

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API Supported Languages

Text improvement languages have not yet been added to the /languages endpoint. For /write/rephrase, writing_style and tone currently work in DE, EN-GB, and EN-US.
Style rules are supported for the following target languages: de, en, es, fr, it, ja, ko, and zh. For more details, see the Style Rules API documentation.