DeepL

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API

API requests can be used to detect the language of a text and/or translate it. The free plan allows for 500 000 characters of translation per month, sign-up requires a credit card for identification.

Upon subscription the API key can be found in the DeepL account.

The API documentation details how to detect and translate a text through HTTP requests, for example

curl -X POST 'https://api-free.deepl.com/v2/translate' \
--header 'Authorization: DeepL-Auth-Key [yourAuthKey]' \
--data-urlencode 'text=Hello, world!' \
--data-urlencode 'target_lang=DE'

with a response in JSON format,

{"translations":[{"detected_source_language":"EN","text":"Hallo, Welt!"}]}

Translating documents is also possible.

Implementations

• Python library: deepl-python