Clone Voice with API

This guide walks you through the process of cloning a voice using Palabra's API.
Voice cloning via API allows you to programmatically create a voice that replicates a specific speaker by submitting a short audio sample and related metadata.

The upload process is similar to the Blob API.

File submission happens in several requests:

The client sends a POST request with a list of files to upload. The server verifies the request and generates a pre-signed URL for each submitted file.
The client sends a POST request to each pre-signed URL with the file to upload (limited to 1 sample for now).
Optional: the client can request GET /saas/voice/m/{voice_id} to check the processing status.

Step 1: Get an API Key

Log in to the Palabra Platform
Go to the API Keys page
Create a new API Key or use an existing one — you'll need it to authenticate requests (Authorization: Bearer <API_KEY> header)

Step 2: Prepare your audio sample

To ensure high-quality voice cloning, please follow the guidelines below when uploading your sample:

Accepted formats: MP3, WAV, FLAC, WEBM, MP4, MPEG, or MPG
Maximum file size: 10 MB
Minimum duration: 30 seconds
Audio quality: No background noise
Speaker requirement: Only one speaker per sample
Input types: Audio or video files are accepted

Step 3: Create the voice cloning request

Voice cloning through the API is performed in two steps:

Step 3.1: Submit voice cloning metadata

First, send a POST request to create a voice cloning task with the metadata of your audio sample.
At this stage, you do not upload the audio file itself — only its metadata is submitted.

Endpoint

https://api.palabra.ai/saas/voice/clone

Sample payload

{
  "data": {
    "name": "My voice",
    "samples": [
      {
        "filename": "20250611_1453_Recording.mp3",
        "mime_type": "audio/mpeg",
        "display_name": "My voice",
        "description": "Description of my voice",
        "denoise": false,
        "lang_code": "en",
        "speech_normalization": true
      }
    ],
    "description": "Description of my voice",
    "labels": {
      "gender": null,
      "age_group": null,
      "mood": null
    }
  }
}

Field descriptions

`name` (required)

A user-defined name for the cloned voice. This will be used to identify the voice in your Palabra account.

`samples` (required)

An array containing exactly one audio sample with its metadata.

filename (required)
The original filename of the uploaded sample.
mime_type (required)
MIME type of the file (e.g., audio/mpeg, audio/wav).
display_name (optional)
Human-readable name to display in the UI.
description (optional)
Additional information about the sample.
speech_normalization (optional)
Whether to apply automatic speech normalization (true or false). Default is false.
denoise (optional)
Whether to apply automatic denoising (true or false). Default is false.
lang_code (required)
Language code of the speaker (e.g., en, uk). Used to optimize voice modeling.

`description` (optional)

A description of the cloned voice for internal reference.

`labels` (optional)

Optional metadata describing the speaker:

gender – One of Female, Male, Neutral, or null.
age_group – One of Young, Middle Age, Senior, or null.
mood – One of Neutral, Happy, Sad, Angry, or null.

Note: Wrap the voice metadata in data. Supply name and exactly one samples item with the required sample fields listed above.

Example: Voice cloning request

JavaScript

const payload = {
  name: "My voice",
  samples: [
    {
      filename: "20250611_1453_Recording.mp3",
      mime_type: "audio/mpeg",
      display_name: "My voice",
      description: "Description of my voice",
      denoise: false,
      lang_code: "en"
    }
  ],
  description: "Description of my voice",
  labels: {
    gender: null,
    age_group: null,
    mood: null
  }
};

const response = await fetch('https://api.palabra.ai/saas/voice/clone', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer <YOUR_API_KEY>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({ data: payload })
});

if (!response.ok) {
  const errorText = await response.text().catch(() => response.statusText);
  throw new Error(`Failed to clone voice: ${response.status} ${errorText}`);
}

Response

HTTP 200 OK. The cloned voice and its upload details are returned in data.

{
  "ok": true,
  "data": {
    "utc_created_at": "2025-06-19T10:52:53.893244",
    "voice_id": "10545719-5dfb-4164-9b39-cc70ed2ff97d",
    "user_id": "02117a4f-a847-4264-9807-704d279bbf3a",
    "name": "My voice",
    "voice_type": "instantly_cloned",
    "processing_status": "created",
    "description": "My voice",
    "labels": {
      "gender": null,
      "age_group": null,
      "mood": null
    },
    "lang_code": "en",
    "samples": [
      {
        "item_id": "0",
        "blob_id": "7e8344fc-4408-4ef7-942b-45d641b2877e",
        "url": "https://palabra-prod-web-cdn.s3.amazonaws.com/",
        "form_data": {
          "acl": "private",
          "bucket": "palabra-prod-web-cdn",
          "key": "blob/author/instant_voice_clone_upload_input_sample/02117a4f-a847-4264-9807-704d279bbf3a/7e8344fc-4408-4ef7-942b-45d641b2877e.mp3",
          "x-amz-meta-blob-id": "7e8344fc-4408-4ef7-942b-45d641b2877e",
          "x-amz-meta-filename": "20250611_1453_Recording.mp3",
          "Content-Type": "audio/mpeg",
          "x-amz-meta-user-id": "02117a4f-a847-4264-9807-704d279bbf3a",
          "x-amz-meta-intent": "instant_voice_clone_upload_input_sample",
          "x-amz-meta-voice-id": "10545719-5dfb-4164-9b39-cc70ed2ff97d",
          "x-amz-meta-upload-id": "10545719-5dfb-4164-9b39-cc70ed2ff97d",
          "x-amz-algorithm": "AWS4-HMAC-SHA256",
          "x-amz-credential": "AKIAR3HUOH7XJLBFCRWH/20250619/eu-central-1/s3/aws4_request",
          "x-amz-date": "20250619T105253Z",
          "policy": "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",
          "x-amz-signature": "b8e3c8607d7b9c66ce92da2f8a0a4b2dbd3578fdb87f671569f5208b343c7a22"
        }
      }
    ]
  }
}

Step 3.2: Upload the audio file

Use the url and form_data fields from each data.samples item returned in Step 3.1 to upload your audio file via POST.

Example: Upload request

JavaScript

async function uploadFile(sample, file) {
  const formData = new FormData();

  for (const [key, value] of Object.entries(sample.form_data)) {
    formData.append(key, value);
  }

  formData.append('file', file, file.name);

  const response = await fetch(sample.url, {
    method: 'POST',
    body: formData,
  });

  if (!response.ok) {
    let errorText;
    try {
      errorText = await response.text();
    } catch {
      errorText = response.statusText;
    }
    throw new Error(`Failed to upload file: ${response.status} ${errorText}`);
  }
}

Once the file is successfully uploaded, the system will automatically begin processing the sample.

You can track the status of the voice cloning task via the https://api.palabra.ai/saas/voice/m/{voice_id} endpoint.

Step 1: Get an API Key​

Step 2: Prepare your audio sample​

Step 3: Create the voice cloning request​

Step 3.1: Submit voice cloning metadata​

Endpoint​

Sample payload​

Field descriptions​

name (required)​

samples (required)​

description (optional)​

labels (optional)​

Example: Voice cloning request​

Response​

Step 3.2: Upload the audio file​

Example: Upload request​