curl -X POST 'https://api.elevenlabs.io/v1/convai/knowledge-base/file' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -F 'file=@sample.bin' \
  -F 'name=string' \
  -F 'parent_folder_id=string'

# POST /v1/convai/knowledge-base/file (ElevenLabs API)
Base URL: https://api.elevenlabs.io
Auth: xi-api-key: <ELEVENLABS_API_KEY>
Last verified: 2026-09-03

> Create File Document

## 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/knowledge-base/file' \
  -H "xi-api-key: $ELEVENLABS_API_KEY" \
  -F 'file=@sample.bin'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| file | body | string | Yes | Documentation that the agent will have access to in order... |
| name | body | string | No | A custom, human-readable name for the document. |
| parent_folder_id | body | string | No | If set, the created document or folder will be placed ins... |

## Response (200 OK)
{"id":"string","name":"string","folder_path":[{"id":"string"}]}

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

POST

/v1/convai/knowledge-base/file

ElevenLabs API

Create File Document

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
→ 219 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/knowledge-base/file' \  -H "xi-api-key: $ELEVENLABS_API_KEY" \  -F 'file=@sample.bin' \  -F 'name=string' \  -F 'parent_folder_id=string'

Get a free ElevenLabs API key → sponsored

Parameters

Name	In	Type	Required	Description
file	body	string	Yes	Documentation that the agent will have access to in order to interact with users.
name	body	string	No	A custom, human-readable name for the document.
parent_folder_id	body	string	No	If set, the created document or folder will be placed inside the given folder.

Response 200 OK

{
  "id": "string",
  "name": "string",
  "folder_path": [
    {
      "id": "string"
    }
  ]
}