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If you find the existing voice doesn’t meet your needs, you can add a custom voice. There’s a limit of 100 custom voices per account. If you need more, please contact us via the Customer Support Portal or support@retellai.com.

Add Custom Voice

In the voice selector, you can click “Add custom voice” to search and add publicly available community voices.

Add Voice Clone

You can also add a voice clone by clicking “Add custom voice” in the voice selector.
1

Access Voice Clone Feature

Open the voice selector and click “Add custom voice”.
2

Train Your Voice Clone

Upload your voice recordings to train the voice clone.

What to say in the recordings

Cloning captures how the voice sounds, not what it says, so you don’t need to read a specific script. Any natural speech works. For the best result:
  • Speak in the tone, pace, and energy you want the agent to use on calls. The clone reproduces the delivery it hears.
  • Use continuous, conversational speech rather than isolated words or long pauses.
  • Record a single speaker with no background noise, music, or echo.
  • Avoid heavily edited or compressed audio. A clean microphone recording works better than audio captured from a phone or video call.

File limits

File limits depend on the voice provider you clone with. Inworld voice cloning accepts up to 3 files and 16 MB of audio in total, while Cartesia, MiniMax, and platform clones take a single file. ElevenLabs clones accept up to 25 files via the Clone Voice API.