Protect your sensitive documents from unauthorized access. Use our free Lock PDF tool to securely encrypt your PDF files with a password. All processing happens locally in your browser, ensuring your data remains 100% private and never touches our servers.
Encrypting document...
Your document has been secured with the provided password.
Secure your documents in three simple steps without installing any software.
Upload Your PDF
Click the "Select File" button or simply drag and drop your PDF document into the designated upload area to get started.
Set a Strong Password
Once your file is loaded, enter a strong and memorable password in the input field. This password will be required for anyone trying to open or view the document.
Protect & Download
Click the "Protect PDF" button. Our tool will instantly encrypt your file. Once finished, click "Download File" to save the secured PDF directly to your device.