Protect PDF (PDF Locker)
Password-protect your PDF files directly on your device with local client-side encryption.
Protect PDF (PDF Locker)
Password-protect and encrypt PDF documents locally in your browser with AES-256. 100% private.
Drag & drop image files here, or browse
Select or drop a PDF document to password-protect.
Zero-knowledge local security: Your documents and passwords stay strictly on your device. We use standard client-side AES-256 Web Crypto encryption; zero bytes leave your device.
How to use Protect PDF (PDF Locker)
Select PDF Document
Choose or drag any unencrypted PDF file into the local dropzone.
Set Document Password
Choose a strong password to restrict viewing or unauthorized access.
Download Encrypted PDF
Save the protected PDF file directly to your device.
Why use ImgZero for Protect PDF (PDF Locker)?
Frequently Asked Questions
Is my password sent to ImgZero servers?
Never. All document processing and encryption occurs purely in your browser's local sandbox.
What PDF viewers can open protected files?
Protected files adhere to standard PDF encryption specifications, compatible with Adobe Acrobat, Apple Preview, and modern browsers.
100% Client-Side Privacy Guarantee
Your files stay on your machine. No server uploads and no file-content tracking.