Protect PDF Pro - Encrypt PDF with Password Client-Side

Local & Secure • 100% Client-Side PDF Encryption • Zero Server Uploads

Protect & Encrypt PDF Files

Secure your sensitive documents with military-grade AES-256 encryption and a custom password right inside your browser.

Drop your PDF file here

Drag and drop any PDF file to encrypt with a password, or browse from your device

AES-256 Bit Encryption

100% Client-Side Privacy

Universal PDF Compatibility

document.pdf

0 KB 0 Pages Total

Enter Password

Confirm Password

Enter matching passwords to secure the document

Password Strength: Empty

Encryption Method

Output File Name

.pdf

Document Permissions Allow Printing Allow Copying text and graphics Allow Modifying document

Security & Privacy Assurance

100% Client-Side encryption using modern Web Cryptography API.
Your PDF and passwords are never transmitted to any server or third party.
Protected documents can be opened in Adobe Acrobat, Chrome, Apple Preview, and all standard PDF readers.
Make sure to remember your password. Due to client-side encryption, lost passwords cannot be recovered.

Military-Grade Document Security

How to Password Protect & Encrypt PDF Files Online

Secure your confidential files with strong AES-256 encryption and custom permission controls with 100% client-side privacy.

1. Select Confidential PDF

Drop any PDF document you wish to lock and protect into the secure browser interface.

2. Set Strong Password

Enter and confirm your secret password, check the real-time strength meter, and select document permissions.

3. Encrypt & Download

Click Encrypt & Download to generate an AES-256 password-locked PDF compatible with all standard PDF readers.

Frequently Asked Questions

Is my password or original PDF sent over the internet?

Never. Protect PDF Pro relies on 100% client-side processing using Web Cryptography. With no server uploads, your password and files never leave your device, ensuring total privacy.

Which PDF viewers can open my encrypted documents?

Your protected PDF complies with universal ISO PDF encryption standards and opens seamlessly in Adobe Acrobat, Google Chrome, Microsoft Edge, Apple Preview, and mobile readers.

Can you recover my PDF if I forget my password?

No. Because encryption is performed locally on your device without backdoors or master keys, forgotten passwords cannot be recovered. Be sure to remember or safely store your password.