PDF Protect LockPRO is a fast and reliable solution to protect your PDF documents from unauthorized access. With a simple interface and working completely offline, you can:

? Lock PDF
Apply strong AES‑256‑R5 encryption protection to your PDF files. Once locked, the PDF cannot be opened on mobile devices, laptops, or MacBooks without the correct password.

? Unlock PDF
Easily revert your PDF to its original format whenever you need access, simply enter the password you chose when locking.

⚙️ 100% Offline
All encryption and decryption processes run locally on your device—no internet connection required—ensuring that your privacy is maintained and your data never leaves your device.

? Custom Password
Choose a password of your choice. The system will ensure that the password is used to generate a very strong AES‑256‑R5 key.

? Easy to Use
– Select PDF from internal storage
– Enter output name and password
– Tap “Lock” or “Unlock” button
– New file will be saved in your selected folder

?️ High-Level Security
Uses AES‑256‑R5 encryption algorithm, the recognized industry standard for protecting sensitive data from hacking or eavesdropping.

Why Choose PDF Protect LockPRO?

Fast Performance – Encrypt and decrypt in seconds for files up to several megabytes in size.

100% Privacy – No servers, no clouds—all your data stays on your device.

Wide Compatibility – Output files can be reopened in all PDF reader apps after unlocking, as long as the correct password is entered.

Key Features

Lock & Unlock PDF with one touch

Advanced AES‑256‑R5 algorithm

Intuitive interface, suitable for beginners to professionals

Works completely offline

Custom output folder selection

Show file size information before process

How to Use

Select File:
Press the File button to select the PDF to be locked or unlocked.

Select Folder:
Press the Folder button to specify the location to save the output.

Set Name & Password:
Fill in your output file name and password.

Process:
Press the “Lock” button to lock, “Unlock” to unlock.

Finish:
Find the new file in the folder you selected.

Download PDF Protect LockPRO now and keep your PDF documents confidential with professional security!