Password Protect Your PDF
Key Features
256-bit AES encryption for maximum security
Password protection to prevent unauthorized access
Customizable document permissions (print, copy, edit)
Supports large PDF files up to 50MB
No file storage - processed and deleted immediately
Compatible with all PDF readers and devices
Common Use Cases
- Protect confidential business documents and contracts
- Secure financial reports and tax documents
- Encrypt legal documents and NDAs
- Protect intellectual property and copyrighted materials
- Secure medical records and patient information
- Lock academic papers and research documents
- Encrypt employee handbooks and HR documents
- Protect client proposals and presentations
How to Use PDF Lock
- Click "Select PDF File" and choose the PDF you want to protect
- Enter a strong password (minimum 4 characters, recommended 8+)
- Select document permissions (all, print only, or read only)
- Click "Lock PDF" to encrypt your document with 256-bit AES
- Download your password-protected PDF file
- Remember your password - store it in a safe place
Frequently Asked Questions
We use 256-bit AES encryption, which is the industry standard and virtually unbreakable. The same encryption is used by banks and government agencies to protect sensitive data.
No, password recovery is not possible. If you forget your password, you won't be able to open the PDF. Make sure to store your password in a safe place like a password manager.
Your files are processed in memory and immediately deleted after encryption. We do not store, archive, or access your files in any way. Your privacy is our priority.
All permissions: users can print, copy text, and edit. Print only: users can print but not copy or edit. Read only: users can only view the PDF without printing, copying, or editing.
Yes, if you have the password, you can open the PDF in any PDF editor and remove the security settings. However, you'll need the original password to unlock it.
Yes, password protection works with all PDF types including scanned documents, fillable forms, and PDFs with images. The encryption is applied to the entire file.
The maximum file size is 50MB. Most PDF documents are well under this limit. If your file is larger, consider compressing it first or splitting it into smaller files.
Currently, our tool processes one PDF at a time to ensure maximum security and reliability. You can lock multiple files by repeating the process for each document.
