If you want to password-protect your PDF documents from outside interference, then maybe you should give PDF Page Lock a test run. It is a free encryption software that lets you easily encrypt PDF ...

This post covers free tools to password protect PDF online in Windows 11/10. You can also set copy, modify, and print permissions to PDF.

A free, open-source alternative to Acrobat is PDFEncrypt, which offers a simple yet effective way to password protect a PDF. The basic interface asks you to choose the file you wish to encrypt.

Wondering how to edit a PDF on a Mac? Want to do it for free? You can! There is a free PDF editor built right into MacOS and it's really easy to use. We show you how to edit a PDF on a Mac, plus ...