Set PDF Password Online Free

Protect your PDF with AES-256 encryption. Set an open password (required to view) and/or an owner password (controls editing and printing permissions).

1 Upload PDF
PDF only · Max size: 50MB
2 Set Passwords
🔑 User Password (required to open the PDF)
Anyone who wants to view the file must enter this password.
🛡️ Owner Password (controls permissions)
Restricts editing, copying, and printing. Leave blank to auto-generate.
3 Protect
💡 The PDF is encrypted on the server using AES-256 — the strongest standard encryption. The file is processed and immediately discarded; it is never stored on our servers.

How to Set a PDF Password

1

Upload PDF — Select any PDF file from your device (up to 50MB).

2

Set Passwords — Enter a user password (to open) and optionally an owner password (to control permissions).

3

Download — Click Protect PDF and your encrypted file downloads instantly.

Frequently Asked Questions

What encryption is used? +
AES-256 — the strongest PDF encryption standard, supported by all modern PDF readers including Adobe Acrobat, Chrome, and Preview on Mac.
What is the difference between user and owner password? +
The user password (open password) is required to open and view the file. The owner password controls permissions — it restricts editing, copying text, and printing. You can set one or both.
Is my PDF stored on the server? +
No. The PDF is processed in memory, returned to you immediately, and never written to disk or stored.
Is this tool free? +
Yes, completely free with no signup required.