Protect PDF Document Online

Encrypt your PDF file with AES 256-bit encryption, custom passwords, and granular permission controls. 100% Free & private.

Select PDF file to encrypt

💡 How to Password Protect PDF Files Online

Step 1: Upload Document

Select or drag and drop your confidential PDF file into the upload box.

Step 2: Set Password

Type your open password and set permission options for printing and text copying.

Step 3: Download PDF

Click Encrypt PDF Document to generate an encrypted PDF file.

Why Protect PDFs with The PDF Lab?

🔐 Military-Grade 256-Bit AES Encryption

Encrypts file headers, cross-references, and content streams with bank-grade AES 256-bit cryptography.

🛑 Printing & Copying Permission Locks

Prevent unauthorized copying of text and images or restrict high-resolution printing for maximum document security.

Frequently Asked Questions

Will PDF readers mandatory prompt for the password? Yes. Standard PDF readers (Adobe Acrobat, Preview, Chrome, Edge, Foxit) will refuse to open the document without entering the correct password.

Is my password saved on your servers? No. Passwords are used strictly to encrypt document stream bytes and are never stored or logged.