Military-Grade PDF Protection
Keep your sensitive information eyes-only with strong AES-256 encryption that stays on your device.
Drag & Drop PDF to Secure
Advanced Document Shielding
In an era of digital vulnerability, protecting your documents is more important than ever. OncePDF allows you to apply strong password protection and encryption to your PDF files directly in your browser. We use local encryption protocols to ensure that your password and your data are never sent across the web.
You can set user passwords for opening documents and owner passwords for restricting permissions like printing or editing. Because the 'Protect' process is entirely local, you can secure your most confidential files with the absolute certainty that your encryption keys remain under your exclusive control.
AES-256
Privacy First
Local Shield
Frequently Asked Questions
Common questions about protect pdf and how it works.
How secure is the password protection?
We use industry-standard AES-256 encryption to protect your PDF files with the password you provide.
Still have questions? Our support team is here to help you.
Contact Support