Sending important documents? Learn how to password protect PDFs for extra security using easy steps with Adobe Acrobat and free online tools.

Do you share PDF files with other people? Here's how to password protect a PDF on Windows for protection against unauthorized access, editing, and printing.

The password that opens a file doesn’t allow its possessor to modify a PDF’s permissions—only the owner password has that privilege. (Apple calls it the “owner” password; Adobe, the ...