> This is a page from the ElevenLabs documentation. For a complete page index, fetch https://elevenlabs.io/docs/llms.txt. For the full documentation in a single file, fetch https://elevenlabs.io/docs/llms-full.txt. # Voice changer POST https://api.elevenlabs.io/v1/speech-to-speech/{voice_id} Content-Type: multipart/form-data Transform audio from one voice to another. Maintain full control over emotion, timing and delivery. Reference: https://elevenlabs.io/docs/api-reference/speech-to-speech/convert ## OpenAPI Specification ```yaml openapi: 3.1.0 info: title: api version: 1.0.0 paths: /v1/speech-to-speech/{voice_id}: post: operationId: convert summary: Voice changer description: >- Transform audio from one voice to another. Maintain full control over emotion, timing and delivery. tags: - subpackage_speechToSpeech parameters: - name: voice_id in: path description: >- ID of the voice to be used. Use the [Get voices](/docs/api-reference/voices/search) endpoint list all the available voices. required: true schema: type: string - name: enable_logging in: query description: >- When enable_logging is set to false zero retention mode will be used for the request. This will mean history features are unavailable for this request, including request stitching. Zero retention mode may only be used by enterprise customers. required: false schema: type: boolean default: true - name: optimize_streaming_latency in: query description: > You can turn on latency optimizations at some cost of quality. The best possible final latency varies by model. Possible values: 0 - default mode (no latency optimizations) 1 - normal latency optimizations (about 50% of possible latency improvement of option 3) 2 - strong latency optimizations (about 75% of possible latency improvement of option 3) 3 - max latency optimizations 4 - max latency optimizations, but also with text normalizer turned off for even more latency savings (best latency, but can mispronounce eg numbers and dates). Defaults to None. required: false schema: type: - integer - 'null' - name: output_format in: query description: >- Output format of the generated audio. Formatted as codec_sample_rate_bitrate. So an mp3 with 22.05kHz sample rate at 32kbs is represented as mp3_22050_32. MP3 with 192kbps bitrate requires you to be subscribed to Creator tier or above. PCM and WAV formats with 44.1kHz sample rate requires you to be subscribed to Pro tier or above. Note that the μ-law format (sometimes written mu-law, often approximated as u-law) is commonly used for Twilio audio inputs. required: false schema: $ref: >- #/components/schemas/V1SpeechToSpeechVoiceIdPostParametersOutputFormat default: mp3_44100_128 - name: xi-api-key in: header required: false schema: type: string responses: '200': description: The generated audio file content: application/octet-stream: schema: type: string format: binary '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' requestBody: content: multipart/form-data: schema: type: object properties: audio: type: string format: binary description: >- The audio file which holds the content and emotion that will control the generated speech. model_id: type: string default: eleven_english_sts_v2 description: >- Identifier of the model that will be used, you can query them using GET /v1/models. The model needs to have support for speech to speech, you can check this using the can_do_voice_conversion property. voice_settings: type: - string - 'null' description: >- Voice settings overriding stored settings for the given voice. They are applied only on the given request. Needs to be send as a JSON encoded string. seed: type: - integer - 'null' description: >- If specified, our system will make a best effort to sample deterministically, such that repeated requests with the same seed and parameters should return the same result. Determinism is not guaranteed. Must be integer between 0 and 4294967295. remove_background_noise: type: boolean default: false description: >- If set, will remove the background noise from your audio input using our audio isolation model. Only applies to Voice Changer. file_format: oneOf: - $ref: >- #/components/schemas/V1SpeechToSpeechVoiceIdPostRequestBodyContentMultipartFormDataSchemaFileFormat - type: 'null' default: other description: >- The format of input audio. Options are 'pcm_s16le_16' or 'other' For `pcm_s16le_16`, the input audio must be 16-bit PCM at a 16kHz sample rate, single channel (mono), and little-endian byte order. Latency will be lower than with passing an encoded waveform. required: - audio servers: - url: https://api.elevenlabs.io - url: https://api.us.elevenlabs.io - url: https://api.eu.residency.elevenlabs.io - url: https://api.in.residency.elevenlabs.io components: schemas: V1SpeechToSpeechVoiceIdPostParametersOutputFormat: type: string enum: - alaw_8000 - mp3_22050_32 - mp3_24000_48 - mp3_44100_128 - mp3_44100_192 - mp3_44100_32 - mp3_44100_64 - mp3_44100_96 - opus_48000_128 - opus_48000_192 - opus_48000_32 - opus_48000_64 - opus_48000_96 - pcm_16000 - pcm_22050 - pcm_24000 - pcm_32000 - pcm_44100 - pcm_48000 - pcm_8000 - ulaw_8000 - wav_16000 - wav_22050 - wav_24000 - wav_32000 - wav_44100 - wav_48000 - wav_8000 default: mp3_44100_128 description: >- Output format of the generated audio. Formatted as codec_sample_rate_bitrate. So an mp3 with 22.05kHz sample rate at 32kbs is represented as mp3_22050_32. MP3 with 192kbps bitrate requires you to be subscribed to Creator tier or above. PCM and WAV formats with 44.1kHz sample rate requires you to be subscribed to Pro tier or above. Note that the μ-law format (sometimes written mu-law, often approximated as u-law) is commonly used for Twilio audio inputs. title: V1SpeechToSpeechVoiceIdPostParametersOutputFormat V1SpeechToSpeechVoiceIdPostRequestBodyContentMultipartFormDataSchemaFileFormat: type: string enum: - pcm_s16le_16 - other default: other description: >- The format of input audio. Options are 'pcm_s16le_16' or 'other' For `pcm_s16le_16`, the input audio must be 16-bit PCM at a 16kHz sample rate, single channel (mono), and little-endian byte order. Latency will be lower than with passing an encoded waveform. title: >- V1SpeechToSpeechVoiceIdPostRequestBodyContentMultipartFormDataSchemaFileFormat ValidationErrorLocItems: oneOf: - type: string - type: integer title: ValidationErrorLocItems ValidationError: type: object properties: loc: type: array items: $ref: '#/components/schemas/ValidationErrorLocItems' msg: type: string type: type: string required: - loc - msg - type title: ValidationError HTTPValidationError: type: object properties: detail: type: array items: $ref: '#/components/schemas/ValidationError' title: HTTPValidationError ``` ## SDK Code Examples ```typescript import { ElevenLabsClient } from "@elevenlabs/elevenlabs-js"; async function main() { const client = new ElevenLabsClient({ apiKey: "xi-api-key", }); await client.speechToSpeech.convert("JBFqnCBsd6RMkjVDRZzb", { outputFormat: "mp3_44100_128", }); } main(); ``` ```python from elevenlabs import ElevenLabs client = ElevenLabs( api_key="xi-api-key", ) client.speech_to_speech.convert( voice_id="JBFqnCBsd6RMkjVDRZzb", output_format="mp3_44100_128", audio="example_audio", ) ``` ```go package main import ( "fmt" "strings" "net/http" "io" ) func main() { url := "https://api.elevenlabs.io/v1/speech-to-speech/JBFqnCBsd6RMkjVDRZzb?output_format=mp3_44100_128" payload := strings.NewReader("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"audio\"; filename=\"\"\r\nContent-Type: application/octet-stream\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"model_id\"\r\n\r\neleven_multilingual_sts_v2\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"voice_settings\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"seed\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"remove_background_noise\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file_format\"\r\n\r\n\r\n-----011000010111000001101001--\r\n") req, _ := http.NewRequest("POST", url, payload) req.Header.Add("xi-api-key", "xi-api-key") req.Header.Add("Content-Type", "multipart/form-data; boundary=---011000010111000001101001") res, _ := http.DefaultClient.Do(req) defer res.Body.Close() body, _ := io.ReadAll(res.Body) fmt.Println(res) fmt.Println(string(body)) } ``` ```ruby require 'uri' require 'net/http' url = URI("https://api.elevenlabs.io/v1/speech-to-speech/JBFqnCBsd6RMkjVDRZzb?output_format=mp3_44100_128") http = Net::HTTP.new(url.host, url.port) http.use_ssl = true request = Net::HTTP::Post.new(url) request["xi-api-key"] = 'xi-api-key' request["Content-Type"] = 'multipart/form-data; boundary=---011000010111000001101001' request.body = "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"audio\"; filename=\"\"\r\nContent-Type: application/octet-stream\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"model_id\"\r\n\r\neleven_multilingual_sts_v2\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"voice_settings\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"seed\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"remove_background_noise\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file_format\"\r\n\r\n\r\n-----011000010111000001101001--\r\n" response = http.request(request) puts response.read_body ``` ```java import com.mashape.unirest.http.HttpResponse; import com.mashape.unirest.http.Unirest; HttpResponse response = Unirest.post("https://api.elevenlabs.io/v1/speech-to-speech/JBFqnCBsd6RMkjVDRZzb?output_format=mp3_44100_128") .header("xi-api-key", "xi-api-key") .header("Content-Type", "multipart/form-data; boundary=---011000010111000001101001") .body("-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"audio\"; filename=\"\"\r\nContent-Type: application/octet-stream\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"model_id\"\r\n\r\neleven_multilingual_sts_v2\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"voice_settings\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"seed\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"remove_background_noise\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file_format\"\r\n\r\n\r\n-----011000010111000001101001--\r\n") .asString(); ``` ```php request('POST', 'https://api.elevenlabs.io/v1/speech-to-speech/JBFqnCBsd6RMkjVDRZzb?output_format=mp3_44100_128', [ 'multipart' => [ [ 'name' => 'audio', 'filename' => '', 'contents' => null ], [ 'name' => 'model_id', 'contents' => 'eleven_multilingual_sts_v2' ] ] 'headers' => [ 'xi-api-key' => 'xi-api-key', ], ]); echo $response->getBody(); ``` ```csharp using RestSharp; var client = new RestClient("https://api.elevenlabs.io/v1/speech-to-speech/JBFqnCBsd6RMkjVDRZzb?output_format=mp3_44100_128"); var request = new RestRequest(Method.POST); request.AddHeader("xi-api-key", "xi-api-key"); request.AddParameter("multipart/form-data; boundary=---011000010111000001101001", "-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"audio\"; filename=\"\"\r\nContent-Type: application/octet-stream\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"model_id\"\r\n\r\neleven_multilingual_sts_v2\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"voice_settings\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"seed\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"remove_background_noise\"\r\n\r\n\r\n-----011000010111000001101001\r\nContent-Disposition: form-data; name=\"file_format\"\r\n\r\n\r\n-----011000010111000001101001--\r\n", ParameterType.RequestBody); IRestResponse response = client.Execute(request); ``` ```swift import Foundation let headers = [ "xi-api-key": "xi-api-key", "Content-Type": "multipart/form-data; boundary=---011000010111000001101001" ] let parameters = [ [ "name": "audio", "fileName": "" ], [ "name": "model_id", "value": "eleven_multilingual_sts_v2" ], [ "name": "voice_settings", "value": ], [ "name": "seed", "value": ], [ "name": "remove_background_noise", "value": ], [ "name": "file_format", "value": ] ] let boundary = "---011000010111000001101001" var body = "" var error: NSError? = nil for param in parameters { let paramName = param["name"]! body += "--\(boundary)\r\n" body += "Content-Disposition:form-data; name=\"\(paramName)\"" if let filename = param["fileName"] { let contentType = param["content-type"]! let fileContent = String(contentsOfFile: filename, encoding: String.Encoding.utf8) if (error != nil) { print(error as Any) } body += "; filename=\"\(filename)\"\r\n" body += "Content-Type: \(contentType)\r\n\r\n" body += fileContent } else if let paramValue = param["value"] { body += "\r\n\r\n\(paramValue)" } } let request = NSMutableURLRequest(url: NSURL(string: "https://api.elevenlabs.io/v1/speech-to-speech/JBFqnCBsd6RMkjVDRZzb?output_format=mp3_44100_128")! as URL, cachePolicy: .useProtocolCachePolicy, timeoutInterval: 10.0) request.httpMethod = "POST" request.allHTTPHeaderFields = headers request.httpBody = postData as Data let session = URLSession.shared let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in if (error != nil) { print(error as Any) } else { let httpResponse = response as? HTTPURLResponse print(httpResponse) } }) dataTask.resume() ```