This means the file in your url: parameter couldn’t be accessed—PDF.co got a 404 Not Found response.
Why this happens
Link expired – Most S3/Firebase/Dropbox links expire quickly
Private or restricted link – Requires login or is blocked
Localhost or intranet file – We can’t reach internal servers
Wrong or incomplete URL – Typo or missing query parameters
How to fix it
Paste the link in incognito mode: If it doesn’t download there, it won’t work with us
Make sure it’s a direct file link: Avoid viewer or preview pages—must go straight to the file
Try uploading instead: Use our Upload API and use the returned file URL