Protect PDF
Protect Pdf — process, convert, and analyze with one click.
or drop PDF here
ZiloPDF Protect PDF tool adds cryptographic security layers to your documents. Restrict access with robust user passwords, set printing and copying permissions, and block unauthorized access to confidential records.
Why Choose ZiloPDF Protect Pdf Tool
Cryptographic Protection
Add secure owner and user passwords to encrypt document contents using standard algorithms.
Restrict Permissions
Block unauthorized users from printing, copying text, or editing PDF contents.
Completely Free Service
Encrypt confidential documents free of cost. No registrations or subscriptions.
Strict Privacy Architecture
Files are processed inside secure local sandboxes and purged fully within 1 hour.
Retain Document Fidelity
Adding security headers does not affect text coordinates or font quality.
Works on Any Web Browser
Secure files on the fly. Works on Windows, macOS, Linux, iOS, or Android devices.
How to Protect Online?
Select PDF document
Upload the PDF file that you want to protect with a password.
Set security options
Define a secure password and toggle custom permissions (print, copy, modify).
Encrypt file
Click Protect PDF to apply the cryptographic locks to your document.
Download protected PDF
Download the encrypted document immediately onto your device.
Everything You Can Do With ZiloPDF Protect Pdf Tool
- Add secure user passwords to PDF files
- Restrict document printing permissions
- Block copying of text contents
- Configure owner administration access
- Save protected files to local folder