Official documentation

Supported Voice Languages

DeepL, DeepL, developer documentation for the Voice API, n.d.

Read on October 20, 2026

What it is: The Supported Voice Languages page of DeepL's developer documentation for the Voice API. It gives a table of languages with three columns: transcription, translation and translated speech. It says that DeepL provides transcription for some languages itself and an external service partner provides it for others.
How much weight it carries: The maker's own API documentation, read on 2026-10-20. It is the most specific official list of the languages Voice can transcribe. The page states no total, so the counts are taken from the table. The DeepL Support article on Voice for Meetings gives different approximate groupings, but it could not be read here because the site showed a bot check.

Facts taken from this source

DeepL's Voice API documentation lists transcription for 43 languages, counting each pair of regional variants, such as English (American) and English (British), as one language.
“**Language** | **Transcription** | **Translation** | **Translated Speech** ... Arabic | ⎋ | ✓ | ⎋ ... Vietnamese | ⎋ | ✓ | ⎋” (Supported Voice Languages table)
DeepL's Voice API documentation lists 48 language and regional variant entries for transcription, each with a transcription mark.
“**Language** | **Transcription** | **Translation** | **Translated Speech** ... Arabic | ⎋ | ✓ | ⎋ ... Vietnamese | ⎋ | ✓ | ⎋” (Supported Voice Languages table)