Protect PDF
Add a password to your PDF to prevent unauthorized access.
Upload PDF
Drag & drop or
About Password Protect PDF
Secure your confidential documents with military-grade AES encryption. This tool allows you to set two levels of passwords: a "User Password" for opening the file, and an "Owner Password" to restrict specific actions like printing, copying text, or modifying the content.
How to Use This Tool
Upload PDF
Select the file to protect or unlock.
Choose Mode
Select "Protect" (Encrypt) or "Unlock" (Decrypt).
Set Permissions
Define what users can do (Print, Edit, Copy).
Download
Save your secured document.
Frequently Asked Questions
Can I recover a forgotten password?
No. Since we do not store your files or passwords, there is no "Forgot Password" feature. Please store your passwords safely.
How strong is the encryption?
We use 128-bit AES encryption, which is the industry standard for securing PDF documents compatible with all modern readers.
Key Features
- •AES-128 Encryption
- •User vs Owner Passwords
- •Disable Printing/Copying
- •Unlock Existing PDFs
- •100% Offline Processing
Understanding Password Protect PDF
PDF Security works by encrypting the file's object stream. Without the correct key (password), the PDF reader cannot decode the binary data to display the pages.
Why Password Protect PDF Matters
Essential for sending contracts, payroll data, or legal documents over email.
Limitations of Password Protect PDF
While this tool is useful, keep in mind:
- Cannot crack unknown passwords (brute-force).
- Encryption strength depends on the length of your password.