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POST
/
voices
/
v1
/
voices:design
cURL
curl --location 'https://api.inworld.ai/voices/v1/voices:design' \
--header "Authorization: Basic $INWORLD_API_KEY" \
--header 'Content-Type: application/json' \
--data '{
  "langCode": "EN_US",
  "designPrompt": "Warm, friendly, conversational voice with a subtle smile; natural pacing; clear articulation.",
  "previewText": "Hey! I am here. What can I help you with today?",
  "voiceDesignConfig": {
    "numberOfSamples": 1
  }
}'
{
  "langCode": "EN_US",
  "previewVoices": [
    {
      "voiceId": "your_workspace_id__design-voice-38b05df9",
      "previewText": "Hey! I am here. What can I help you with today? I would be happy to assist you with whatever you need. Just let me know how I can be of service.",
      "previewAudio": "<base64-audio>"
    }
  ]
}

Documentation Index

Fetch the complete documentation index at: https://dev.docs.inworld.ai/llms.txt

Use this file to discover all available pages before exploring further.

Design a voice from a text description. This endpoint generates up to three preview voices that can then be published to your voice library using the Publish Voice endpoint. For a guided workflow, see Voice Design in the docs.
Preview text length: The previewText must result in generated audio that is 1-15 seconds long (~50-200 characters in English).

Authorizations

​
Authorization
string
header
required

Your API key. Read permissions are required for GET endpoints. Write permissions are required for POST, PATCH, and DELETE endpoints.

For Basic authentication, please populate Basic $INWORLD_API_KEY

Body

application/json

Request message for DesignVoice.

​
designPrompt
string
required

Text description of the desired voice. Must be in English and between 30 and 250 characters. For best results, include age, gender, accent, pitch, pace, and tone. See Voice Design Best Practices for more details.

Example: "A middle-aged male voice with a clear British accent speaking at a steady pace and with a neutral tone."

​
langCode
enum<string>
required

Language code for the voice preview.

Available options:
EN_US,
ZH_CN,
KO_KR,
JA_JP,
RU_RU,
AUTO,
IT_IT,
ES_ES,
PT_BR,
DE_DE,
FR_FR,
AR_SA,
PL_PL,
NL_NL,
HI_IN,
HE_IL
​
previewText
string
required

Script for the generated voice to speak. Must result in audio that is 1-15 seconds.

The script will shape the voice that gets generated, as the model will tailor the voice to suit the content it's speaking. See Voice Design Best Practices for more details.

​
voiceDesignConfig
object

Voice design configuration for generating the preview. If not provided, defaults to generating 1 sample.

Response

A successful response.

Response message for DesignVoice.

​
langCode
enum<string>

The language code of the generated previews.

Available options:
EN_US,
ZH_CN,
KO_KR,
JA_JP,
RU_RU,
AUTO,
IT_IT,
ES_ES,
PT_BR,
DE_DE,
FR_FR,
AR_SA,
PL_PL,
NL_NL,
HI_IN,
HE_IL
​
previewVoices
object[]

Preview voices generated (in DRAFT status). Up to 3 voices will be generated each time you call this endpoint. Use Publish Voice to promote one to your library.