How to Protect PDF — 3 Simple Steps
1
Upload the PDF file you want to protect.
2
Set a password and choose permission restrictions.
3
Click 'Protect' and download your secured PDF.
Why Protect PDF with LittlePDF?
- AES-256 encryption — the same standard used by banks and government agencies worldwide.
- Set separate open passwords and owner permissions for granular access control.
- Encryption is applied in your browser; your password is never transmitted anywhere.
- Free to use with no limits — protect as many documents as you need.
Features
AES-256 Encryption
Industry-standard encryption secures your PDF against unauthorized access. Brute-force attacks are computationally infeasible at this encryption level.
Granular Permissions
Set an open password to restrict viewing, plus owner permissions to control printing, copying, and editing independently.
Browser-Side Security
The password you choose and the encrypted file are generated entirely in your browser. No credentials or document content ever leave your device.
Frequently Asked Questions
Processed locally. Text/PDF never leave your device.