Voice Changer - Unifically

Convert the voice in an audio file to a target ElevenLabs voice using speech-to-speech technology. Try it in the browser: ElevenLabs Voice Changer API playground.

Model

elevenlabs/voice-changer

Parameters

Parameter	Type	Required	Default	Description
`audio_url`	string	Yes	-	URL of the source audio file to convert
`voice_id`	string	Yes	-	Target ElevenLabs voice ID
`model_id`	string	No	`eleven_multilingual_sts_v2`	ElevenLabs speech-to-speech model ID
`output_format`	string	No	-	Audio output format (e.g. `mp3_44100_128`)
`file_format`	string	No	-	Input audio format hint: `pcm_s16le_16` or `other`
`remove_background_noise`	boolean	No	-	Strip background noise from input audio before conversion
`seed`	integer	No	-	Random seed for reproducible generation (0–4294967295)
`voice_settings`	object	No	-	Advanced voice configuration overrides (see below)

voice_settings

Field	Type	Description
`stability`	number	0–1. Voice stability
`similarity_boost`	number	0–1. How closely to match the target voice
`style`	number	0–1. Style exaggeration
`speed`	number	Speech speed multiplier
`use_speaker_boost`	boolean	Boost speaker clarity

Resources

Get available voices from the Resources API:

GET /v1/resources/elevenlabs/voices

Example

curl -X POST https://api.unifically.com/v1/tasks \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "elevenlabs/voice-changer",
    "input": {
      "audio_url": "https://example.com/source-audio.mp3",
      "voice_id": "TX3LPaxmHKxFdv7VOQHJ",
      "model_id": "eleven_multilingual_sts_v2",
      "output_format": "mp3_44100_128",
      "remove_background_noise": true,
      "seed": 42,
      "voice_settings": {
        "stability": 0.5,
        "similarity_boost": 0.75,
        "style": 0.5,
        "speed": 1.0,
        "use_speaker_boost": true
      }
    }
  }'

Response

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "processing"
  }
}

Completed Response

{
  "code": 200,
  "success": true,
  "data": {
    "task_id": "abc123def456",
    "status": "completed",
    "output": {
      "audio_url": "https://files.unifically.com/audio/abc123.mp3"
    }
  }
}

Volume discounts are available for almost all models. Reach out at contact@unifically.com to discuss custom pricing.