Protect PDF
FreeAdd password protection and permission restrictions to PDFs
protectpasswordencryptsecuritypdf
All PDF ToolsHow it works
1
Upload
Add the PDF file you want to protect with a password.
2
Configure
Set a password and choose permission restrictions such as preventing printing, copying, or editing.
3
Download
Save the password-protected PDF with your chosen security settings applied.
Frequently asked questions
What is the difference between an open password and a permissions password?+
An open password is required to view the PDF at all. A permissions password restricts specific actions like printing, copying text, or editing while still allowing the document to be opened.
What encryption standard is used?+
The tool uses AES-128 or AES-256 encryption depending on your selection. AES-256 offers stronger protection and is recommended for sensitive documents.
Are my files uploaded to a server during encryption?+
No. Password protection is applied entirely in your browser. Your files are processed locally and never leave your device.
Can I protect a PDF that already has a password?+
You would need to unlock the existing password first, then apply new protection settings. The tool cannot layer a second password on top of an existing one.
Will recipients need special software to open the protected PDF?+
No. Any standard PDF reader such as Adobe Acrobat, Preview, or Chrome's built-in viewer can open password-protected PDFs. The recipient just needs the password you share with them.