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POST
/
storage
/
files
/
sign
Sign file URL
curl --request POST \
  --url https://api.fal.ai/v1/storage/files/sign \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "expiration_seconds": 3600
}
'
{
  "signed_url": "https://v3.fal.media/files/b/0a1b2c3d/output.png?identity=..."
}

Authorizations

​
Authorization
string
header
required

API key must be prefixed with "Key ", e.g. Authorization: Key YOUR_API_KEY

Query Parameters

​
url
string<uri>
required

Full URL of the fal CDN file, as returned by the upload APIs (https://v3.fal.media/files/b//). Must not contain query parameters.

Example:

"https://v3.fal.media/files/b/0a1b2c3d/output.png"

Body

application/json

Signing options for the file URL

​
expiration_seconds
integer
required

How long the signed URL stays valid, in seconds (max 7 days)

Required range: 1 <= x <= 604800
Example:

3600

Response

Signed URL granting temporary access

Signed URL response

​
signed_url
string
required

URL with an embedded signature granting temporary access

Example:

"https://v3.fal.media/files/b/0a1b2c3d/output.png?identity=..."