How It Works
- Upload your PDF file
- Enter a strong password
- Choose protection options
- Click "Lock PDF"
- Download your password-protected PDF
🔒 Your files never leave your device. All PDF processing happens locally in your browser using WebAssembly technology.
100% Offline Processing
No data is uploaded to any server. All processing happens locally on your device. Your files never leave your computer. True privacy guaranteed.
Files do not leave your deviceAnyone can verify - check Network tabUse these tools without fear
Upload Files
Click to browse or drag and drop files here
About Lock PDF Tool
Protect your PDF files with password encryption. Add password protection to prevent unauthorized access, editing, or printing.
🔒 100% Secure & Private
Your files never leave your device. All PDF processing happens locally in your browser using WebAssembly technology.
No File Upload to Server
All Processing in Your Browser
0 MB Data Used
Network Efficient