Lock PDF — Password Protect PDF Online
Add password protection to your PDF files. Encrypt PDFs to prevent unauthorized access.
Upload your PDF
Drag & drop your PDF to lock
Max 50MB • .pdf
Files are processed in your browser — never uploaded
How to Use
1
Upload your PDF.
2
Enter a secure password.
3
Click "Lock PDF" to encrypt.
4
Download the password-protected PDF.
Features
Password protect PDF files
Secure encryption
Browser-based processing
No uploads to servers
Free to use
Instant protection
FAQ
Protect sensitive PDF documents with password encryption before sharing. Our Lock PDF tool adds password protection to prevent unauthorized access. Perfect for contracts, financial documents, and personal files that need an extra layer of security.