curl -X POST 'https://api.elevenlabs.io/v1/convai/agents/agent-id/avatar' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -F 'avatar_file=@sample.bin'

# POST /v1/convai/agents/{agent_id}/avatar (ElevenLabs API)
Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03

> Post Agent Avatar

## Critical Gotchas
* Authentication uses the non-standard `xi-api-key` header, not `Authorization: Bearer`. Sending a Bearer token returns HTTP 401.
* Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (`--output speech.mp3`) rather than parsing it.

## cURL
curl -X POST 'https://api.elevenlabs.io/v1/convai/agents/agent-id/avatar' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -F 'avatar_file=@sample.bin'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| agent_id | path | string | Yes | The id of an agent. This is returned on agent creation. |
| avatar_file | body | string | Yes | An image file to be used as the agent's avatar. |

## Response (200 OK)
{"agent_id":"string","avatar_url":"string"}

---
Need an API key? Get one at https://elevenlabs.io/app/sign-up

POST

/v1/convai/agents/{agent_id}/avatar

ElevenLabs API

Post Agent Avatar

Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03 · upstream hash matched

Actions

Agents: curl -H "Accept: text/markdown" this URL
→ 197 tokens · Vary: Accept

Critical gotchas

Authentication uses the non-standard xi-api-key header, not Authorization: Bearer. Sending a Bearer token returns HTTP 401.

Text-to-speech responses are raw binary audio, not JSON. Write the body to a file (--output speech.mp3) rather than parsing it.

cURL

curl -X POST 'https://api.elevenlabs.io/v1/convai/agents/agent-id/avatar' \  -H "xi-api-key: $ELEVENLABS_API_KEY" \  -F 'avatar_file=@sample.bin'

Get a free ElevenLabs API key → sponsored

Parameters

Name	In	Type	Required	Description
agent_id	path	string	Yes	The id of an agent. This is returned on agent creation.
avatar_file	body	string	Yes	An image file to be used as the agent's avatar.

Response 200 OK

{
  "agent_id": "string",
  "avatar_url": "string"
}