SECURITY · FREE ONLINE TOOL
Protect PDF
Encrypt a PDF with a new opening password using AES-256.
Drop your file here
.pdf · PDF · 50 MB per file
Document preview
LIVEA fresh start for your file
Choose a file to get started. It stays on your device.
Your files stay on your device.
A FEW SIMPLE STEPS
How to password protect a PDF
- 01
Choose your PDF; enter its current password only if it is already protected.
- 02
Enter a New opening password and check the document preview.
- 03
Click Protect PDF and download the encrypted copy. Keep the new password safe.
Before you download
Keep your password safe. You will need it to open the encrypted file.
Why does the preview look the same after I protect a PDF?
Password protection controls opening the file and does not change its visible pages. The downloaded PDF uses AES-256 encryption and requires your new opening password. Keep a safe copy of that password.
Is Protect PDF free?
Yes. There is no subscription, account or paid API key. Your browser processes the files on your device. Larger documents need more memory and time.
Where are my files processed?
In this tab. Selected document files are not sent to a conversion server. Closing the tab clears the working session; downloaded files remain on your device.