---
title: "Change the voice of an audio file"
method: POST
path: "/audio/voice-change"
tags: ["audio"]
---

# Change the voice of an audio file

`POST /audio/voice-change`

## Request

- Base URL: `https://api.krater.ai/v1`
- URL: `https://api.krater.ai/v1/audio/voice-change`
- Auth: HTTP bearer

Re-voice existing speech audio using an ElevenLabs voice. Returns binary audio.

## Request body

- object
  - `audio_url` string, uri, required: Public URL of the source audio file.
  - `voice` string, required: ElevenLabs voice ID to apply.

## Response `200`

Binary audio data.

## Other responses

- `400`: Invalid request body or parameters.
- `401`: Missing or invalid API key. Pass Authorization: Bearer kr_live_...
- `402`: Not enough credits, or the API key's daily credit cap is reached.
- `429`: Rate limit exceeded (default 60 requests per minute per key). Includes a Retry-After header.

---

[API](https://skmtc.dev/krater/apis/krater-api.md) - [All operations](https://skmtc.dev/krater/apis/krater-api/llms.txt) - [OpenAPI document](https://skmtc.dev/krater/apis/krater-api/revisions/66005541188c?raw)