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Protect PDF
Encrypt and secure your PDF documents with custom passwords entirely in your browser.
100% Secure Local Encryption
Select PDF document
Drag & drop or select a PDF file to encrypt
Document Selected
document.pdf (0 KB) - Ready to lock
Offline Cryptographic Sandbox Active
Your document is loaded in local browser RAM. Type the password on the right and click "Encrypt & Download PDF".
Security Parameters
Encrypting document...
Frequently Asked Questions
Quick direct-answer guides about using this utility tool locally and securely.
How does Protect PDF work locally?
We use standard client-side PDF encryption algorithms to secure your file in-memory using the provided password. Your files and passwords are never transmitted over the network.
What is the difference between a user password and an owner password?
A User Password is required to open and read the PDF. An Owner Password is required to change permissions, such as allowing or restricting copying text, editing, or printing.
Will password protection work on all PDF viewers?
Yes, our encryption complies with the standard PDF specifications, meaning it will prompt for a password in Adobe Acrobat, Google Chrome, Apple Preview, and other compliant readers.