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POST
/
v3
/
async
/
txt2speech
Text to Speech
curl --request POST \
  --url https://api.novita.ai/v3/async/txt2speech \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: <content-type>' \
  --data '
{
  "extra": {
    "response_audio_type": "<string>",
    "webhook": {
      "url": "<string>",
      "test_mode": {
        "enabled": true,
        "return_task_status": "<string>"
      }
    },
    "enterprise_plan": {
      "enabled": true
    }
  },
  "request": {
    "voice_id": "<string>",
    "language": "<string>",
    "texts": [
      "<string>"
    ],
    "volume": 123,
    "speed": 123
  }
}
'
{
  "task_id": "<string>"
}
This Text-To-Speech API converts written text into natural-sounding speech across multiple languages. Utilizing advanced voice synthesis technology, it delivers clear and lifelike vocal output, suitable for a wide range of applications, including e-learning platforms, accessibility tools, virtual assistants, and multimedia presentations.
This is an asynchronous API; only the task_id will be returned. You should use the task_id to request the Task Result API to retrieve the speech generation results.

​
Request Headers

​
Content-Type
string
required
Enum: application/json
​
Authorization
string
required
Bearer authentication format, for example: Bearer {{API Key}}.

​
Request Body

​
extra
object
Optional extra parameters for the request.
​
request
object
required

​
Response

​
task_id
string
Use the task_id to request the Task Result API to retrieve the generated outputs.

​
Example

request 
curl --location 'https://api.novita.ai/v3/async/txt2speech' \
--header 'Authorization: Bearer {{API Key}}' \
--header 'Content-Type: application/json' \
--data '{
  "request": {
    "voice_id": "Emily",
    "language": "en-US",
    "texts": [
      "To be or not to be, that is a question."
    ],
    "volume": 1.2,
    "speed": 1.0
  }
}'
response 
{
  "task_id": "b49df8dc-4a72-474b-a863-xxx"
}
Last modified on June 12, 2026