You can use the free PDFGear app to encrypt a PDF. Open the PDF file in the program and click the Tools tab at the top of the window. Now, click the Password icon, enter and, in the Set Password box, ...

Password protecting a sensitive PDF file is a great way to secure its contents from prying eyes. However, sharing a password-protected PDF can be a logistical nightmare, especially if the contents ...

If you want to share a PDF file with other people, but need to protect it from being viewed by unwanted eyes, LibreOffice has a built-in password-protect feature.

Opening a PDF file with the password can be challenging since you can't unlock it without remembering a password.

Open the file, enter the password, and re-save it as a new PDF. Whether on Windows, macOS, Android, or iOS, you can unlock ...