POST
/
v1
/
files
cURL
curl -X POST "https://api.anthropic.com/v1/files" \
     -H "x-api-key: $ANTHROPIC_API_KEY" \
     -H "anthropic-version: 2023-06-01" \
     -H "anthropic-beta: files-api-2025-04-14" \
     -F "file=@/path/to/document.pdf"
{
  "created_at": "2023-11-07T05:31:56Z",
  "downloadable": false,
  "filename": "<string>",
  "id": "<string>",
  "mime_type": "<string>",
  "size_bytes": 1,
  "type": "file"
}
The Files API allows you to upload and manage files to use with the Claude API without having to re-upload content with each request. For more information about the Files API, see the developer guide for files.
The Files API is currently in beta. To use the Files API, you’ll need to include the beta feature header: anthropic-beta: files-api-2025-04-14.Please reach out through our feedback form to share your experience with the Files API.

Headers

​
anthropic-beta
string[]

Optional header to specify the beta version(s) you want to use.

To use multiple betas, use a comma separated list like beta1,beta2 or specify the header multiple times for each beta.

​
anthropic-version
string
required

The version of the Claude API you want to use.

Read more about versioning and our version history here.

​
x-api-key
string
required

Your unique API key for authentication.

This key is required in the header of all API requests, to authenticate your account and access Anthropic's services. Get your API key through the Console. Each key is scoped to a Workspace.

Body

multipart/form-data
​
file
file
required

The file to upload

Response

Successful Response

​
created_at
string<date-time>
required

RFC 3339 datetime string representing when the file was created.

​
filename
string
required

Original filename of the uploaded file.

Required string length: 1 - 500
​
id
string
required

Unique object identifier.

The format and length of IDs may change over time.

​
mime_type
string
required

MIME type of the file.

Required string length: 1 - 255
​
size_bytes
integer
required

Size of the file in bytes.

Required range: x >= 0
​
type
enum<string>
required

Object type.

For files, this is always "file".

Available options:
TitleConst
Typefile
​
downloadable
boolean
default:false

Whether the file can be downloaded.