🔒 Lock PDF - Add Password Protection
Protect your sensitive PDF documents by adding a password. Only people with the password will be able to open the file.
Secure Your PDF Files with Password Protection
Add password protection to your sensitive PDF documents. Our tool uses strong AES-128 encryption to keep your files secure. Only people with the password can open the document.
How to Lock a PDF
- Upload your PDF file
- Enter a strong password
- Click "Lock PDF" button
- Download your password-protected PDF
Tips for Strong Passwords
- Use at least 12 characters
- Include uppercase, lowercase, numbers, and symbols
- Don't use personal information
- Use a password manager to store your passwords
Use Cases for PDF Locking
- Sensitive financial documents
- Legal contracts and agreements
- Confidential business reports
- Personal identification documents
- Medical records
❓ Frequently Asked Questions
Q: Is this PDF lock tool free?
A: Yes, completely free with no hidden charges.
Q: What encryption does it use?
A: We use 128-bit AES encryption for strong security.
Q: Can I remove password later?
A: Yes, use our PDF Unlock tool to remove password.
Q: Will my original file be stored?
A: No, all files are automatically deleted after processing.