Password-protecting a PDF adds a security layer that prevents unauthorized access. Here's how to do it properly.
Two Types of PDF Passwords
1. Document Open Password (User Password)
- Required to open the PDF at all
- Without it, you can't view the content
2. Permissions Password (Owner Password)
- PDF opens normally, but certain actions are restricted
- Can prevent: printing, copying, editing
How to Password Protect a PDF
Method 1: Online Tool (Easiest)
- Go to lexosign.com/protect-pdf
- Upload your PDF
- Enter your chosen password
- Select permissions (optional)
- Click Protect
- Download protected PDF
Security: Uses 256-bit AES encryption (same as banks)
Choosing a Strong Password
Good Passwords
- At least 12 characters
- Mix of uppercase, lowercase, numbers, symbols
- Not based on personal information
Bad Passwords
- "password" or "123456"
- Your name, birthday, company name
Encryption Levels
| Level | Security | Compatibility |
|---|---|---|
| AES 256-bit | Highest | Acrobat 7+ |
| AES 128-bit | High | Acrobat 5+ |
| RC4 40-bit | Low (avoid) | Very old software |
When to Password Protect
Good Use Cases:
- Confidential business documents
- Personal financial information
- Legal contracts
- Medical records
Removing Password Protection
If you know the password:
- Go to lexosign.com/unlock-pdf
- Upload the protected PDF
- Enter the password
- Download the unlocked version
Conclusion
Password protection is essential for sensitive PDFs:
- Protect your PDF with a strong password
- Use 256-bit AES encryption
- Share the password through a different channel