Free PDF Password Protector Online - Encrypt & Secure PDFs
Add password protection and encryption to your PDF files instantly in your browser. Our free PDF protector uses RC4 128-bit encryption to secure confidential documents before sharing. Set an open password to restrict viewing access. Unlike cloud services, your sensitive files never leave your device—all encryption happens locally with 100% privacy. Perfect for contracts, financial documents, and sensitive business files.
1When to use this tool?
💡Lock confidential business documents
💡Secure contracts with password before sending
💡Protect sensitive information from unauthorized access
2Features
- Lock PDF with password
- RC4 128-bit encryption
- Secure PDF 100% client-side
- No file upload to servers
- Works offline
3How to Use
- Upload the PDF file you want to protect.
- Set an optional Open Password (required to view).
- Set a required Permission Password.
- Click 'Protect PDF' to download the secured file.
FAQ
Q. Is my file secure?
A. Yes, all processing happens locally in your browser. Your files are never uploaded.
Q. What encryption is used?
A. We use RC4 128-bit encryption which is the PDF standard security.