- Send one audio stream
- Receive transcripts in the source language
- Receive translations in multiple target languages
- closed beta Receive translated speech
Speech-to-text (real-time transcription and text translation) is available to all customers with a paid DeepL API subscription. Speech-to-speech (translated TTS output) is a separate capability in closed beta and not included in standard API subscriptions.The provisions applying to DeepL API Enterprise subscriptions also apply to Voice API speech-to-text, with additions to the Terms and Conditions, Service Specification, and Data Processing Agreement (new sub-processors have been added to serve specific languages).
Start here
Real-Time Voice Quickstart
Create a session, stream audio over WebSocket, and handle reconnections, with a complete Python example.
Understanding Voice Sessions
Understand the session flow, token lifecycle, and how audio and results are delivered.
Message Encoding
Choose between JSON and MessagePack for WebSocket messages.
Supported Languages, Formats, and Limits
Check language availability, supported audio codecs and containers, and session limits.
API reference
Full request, message, and response schemas for the Voice API endpoints.
Customization
Two optional features let you tailor transcription and translation to your domain:- beta Spoken terms: improve transcription of frequently used terms such as company-specific terminology, acronyms, product names, and team member names. Manage them in DeepL Home; management via API is coming soon.
- Glossaries: enforce specific translations for terms in the target language. Manage them in DeepL Home or programmatically with the Glossaries API.