PDF security
Control who can open your PDFs and mark their status. Password-protect files with strong encryption, remove passwords you know, and stamp watermarks, all through a fast, private API where files and passwords are never stored.
What does securing a PDF involve?
Securing a PDF is about controlling who can open it and marking its status. Password protection encrypts the file so only people with the password can read it; unlocking removes a password you already know; watermarking overlays text like CONFIDENTIAL or DRAFT so a document's status is clear at a glance.
These operations run through the FileAlloy API, where your file and any password are processed in memory and deleted the moment the response is sent. Nothing is stored or logged, the servers are EU-hosted, and there is a free tier to start.
One API for all of it
Every operation here is also a single call on the FileAlloy API, so you can automate it at scale. Files are processed in memory and never stored, on EU-hosted servers, with deterministic output and a free tier to start.
Get an API keyFrequently asked questions
How strong is the encryption?
Protected PDFs use 256-bit AES, the standard strong encryption for PDF documents, and open in any reader that prompts for the password.
Is my password ever stored?
No. The file and password are processed in memory and deleted immediately after the response. We never keep or log them.
Can I unlock any PDF?
You can remove a password you already know by supplying it. This does not crack unknown passwords.