Protect PDF with Password
Add password protection to a PDF with AES-256 encryption directly in your browser.
Browser-based encryption
Your PDF and password are processed directly in your browser for this tool. They do not need to be uploaded to a conversion server.
How to password protect a PDF
Select your PDF
Choose the PDF document you want to protect.
Create a password
Enter and confirm the password that should be required when the PDF is opened.
Download the protected PDF
Encrypt the file and download the password-protected PDF to your device.
Secure PDFs with AES-256 encryption
PDF password protection helps prevent people who do not know the password from opening the document. This tool applies AES-256 encryption to supported PDF files directly in your browser.
Choose a strong, unique password and store it safely. Anyone who needs to open the protected document will need the password in a compatible PDF reader.
Frequently asked questions
What happens after I protect a PDF?
The downloaded PDF is encrypted and compatible PDF readers should ask for the password before opening the document.
What encryption does this tool use?
This tool uses AES-256 PDF encryption. AES-256 requires a secure browser context such as HTTPS or localhost.
Can I recover a forgotten PDF password?
This tool does not store your password or provide password recovery. Keep the password somewhere safe before sharing or archiving the protected PDF.
Are my PDF and password uploaded to a server?
For this tool, supported PDFs and passwords are processed directly in your browser and do not need to be uploaded to a conversion server.