How can I add password to PDF for protection from Windows 11?

On Windows 11, how to add password to PDF on Windows can mean adding an open password to prevent unauthorized users from opening a PDF, or using a permissions password to restrict editing, copying, or printing. These are different forms of protection, and permissions restrictions are not absolute DRM because someone who can view the document may still reproduce its visible content.

• Online PDF protection on Windows

Windows 11, Microsoft Edge, and Microsoft Print to PDF do not include a built-in feature for adding a password to an existing PDF. Edge can open a protected PDF when you enter its password, but it cannot create the protection.

Encrypting a Word document, protecting a ZIP archive, or recreating the PDF with Microsoft Print to PDF is not the same as applying password protection to the PDF itself. Use an online PDF protection tool or a desktop PDF editor instead.

Protect a PDF online with Adobe Acrobat

Adobe Acrobat Online provides a browser-based Protect PDF tool when you do not want to install an application.

1. Open Adobe Acrobat Online and select the Protect PDF tool.
2. Click Select a file or drag the PDF into the upload area.
3. Enter a strong password and retype it to confirm.
4. Click Set password and sign in if prompted.
5. Download the protected PDF, reopen it, and verify that the password is required.

This online method adds a password for opening the PDF, but it does not provide the detailed printing, copying, and editing restrictions available in the desktop version of Acrobat. The file is handled by Adobe servers, so use a desktop application for confidential documents.

• Windows applications (Offline Use)

Add a password for free with PDFgear Desktop

PDFgear is a free PDF editor for Windows 11 that does not require an account or sign-in, making it useful for how to password protect a PDF for free. Its desktop password tool can add an open password while retaining the PDF's original structure. All features in the PDFgear desktop app run locally and support offline PDF password protection, so PDF files do not need to be uploaded to a server.

1. Download the app from the PDFgear Website and open the PDF in it.
2. From the top toolbar, select Protect > Password.
3. Enter the password in the first box and enter it again to confirm.
4. Click OK, then save the PDF to apply the password protection.

PDFgear's basic Password tool provides free PDF password protection by preventing the document from being opened without the password, making it suitable when you want to password protect a PDF without Acrobat.

Control opening and editing with Adobe Acrobat Pro

Adobe Acrobat Pro is the paid professional option when you need either an open password or permissions-based protection. The free Adobe Acrobat Reader can open protected PDFs, but it does not provide the complete workflow for adding this protection.

1. Open the PDF in Adobe Acrobat Pro.
2. From the Menu in the upper-left corner, select Protect Using Password.
3. Choose Viewing to require a password for opening, or Editing to restrict changes.
4. Enter and confirm the password, then select Apply.
5. Save the protected PDF under a new name and reopen it to test the security settings.

For how to password protect PDF without Adobe, use PDFgear Desktop when you only need a password to open the PDF. If you need both an open password and permissions controls for editing, copying, or printing, Adobe Acrobat Pro is the paid option.