Translation is always provided by DeepL. For some languages, transcription and translated speech are provided by external service partners. All source languages can be translated into any target language.
Language
Transcription
Translation
closed beta Translated Speech
Arabic
⎋
✓
⎋
Bengali
⎋
✓
—
Bulgarian
⎋
✓
⎋
Chinese (Simplified/Traditional)
✓
✓
✓
Croatian
⎋
✓
—
Czech
✓
✓
⎋
Danish
⎋
✓
⎋
Dutch
✓
✓
✓
English (American/British)
✓
✓
✓
Estonian
⎋
✓
—
Finnish
⎋
✓
⎋
French
✓
✓
✓
German
✓
✓
✓
Greek
⎋
✓
⎋
Hebrew
⎋
✓
—
Hindi beta
⎋
✓
⎋
Hungarian
⎋
✓
⎋
Indonesian
✓
✓
⎋
Irish
⎋
✓
—
Italian
✓
✓
✓
Japanese
✓
✓
✓
Korean
✓
✓
✓
Latvian
⎋
✓
—
Lithuanian
⎋
✓
—
Malay beta
⎋
✓
⎋
Maltese
⎋
✓
—
Norwegian (bokmål)
⎋
✓
⎋
Polish
✓
✓
✓
Portuguese (Brazil/Portugal)
✓
✓
✓
Romanian
✓
✓
⎋
Russian
✓
✓
✓
Slovak
⎋
✓
⎋
Slovenian
⎋
✓
—
Spanish
✓
✓
✓
Swedish
✓
✓
✓
Tagalog
⎋
✓
—
Tamil beta
⎋
✓
⎋
Thai
⎋
✓
—
Turkish
✓
✓
✓
Ukrainian
✓
✓
⎋
Vietnamese
⎋
✓
⎋
✓ provided by DeepL / ⎋ provided by an external service partner / — not available
Transcription provided by external service partners (marked with ⎋) cannot yet auto-detect the source language,
which you must therefore specify explicitly.
To retrieve supported languages and feature availability programmatically, call GET /v3/languages?resource=voice and check for the transcription and translated_speech feature keys. The external flag on these features indicates if they are provided by an external service partner.
Maximum 5 translation targets per session (including translated speech targets)
Maximum 1 translated speech target per session
Audio chunk size: should not exceed 100 kilobytes or 1 second duration
Recommended chunk duration: 50-250 milliseconds for low latency
Audio stream speed: maximum 2x real-time
Timeout: if no data is received for 30 seconds, the session is terminated
Maximum connection duration: after 1 hour, the connection is closed. Establish a new connection by reconnecting to the session
Using any given token more than once to establish a WebSocket connection terminates the associated session immediately for security reasons
If you need more translation targets or translated speech targets than these limits allow, open multiple concurrent sessions over the same source audio.
