Protect PDF
Password-protect PDFs with AES-256 encryption in your browser.
Everything is processed locally in your browser.
Tool
Why Dockzio?
Simple tools that respect your time and your privacy.
Free and instant
No subscriptions, no paywalls, no waiting.
No sign-up required
Open a tool and get to work immediately.
Private by design
Processing happens locally in your browser whenever possible.
Beautifully built
Clean, fast interfaces designed for everyday productivity.
About Protect PDF
Add real AES-256 password protection to a PDF in your browser. Set a user password to open the file, an optional owner password, and permission flags for printing, copying, and editing.
How it works
Dockzio encrypts your PDF with the PDF 2.0 security handler (AES-256, revision 6) using the Web Crypto API. Nothing is uploaded.
Passwords
The user password is required to open the document. The owner password (optional) can change permissions; if omitted, it matches the user password.
Permissions
Printing, copying, and editing flags are honored by most readers. They are advisory — use a strong user password when confidentiality matters.
Privacy first
Encryption runs entirely on your device. Your PDF and passwords never leave the browser.
FAQ
Quick answers to common questions.