Any help will be appreciated!” The quickest way to do this is to ZIP the PDF file and protect the ZIP file, or use Microsoft Office’s built-in encryption tools to create a password.

To convert ZIP files to PDF, it’s advised to use WinZip or any other tool that we mention in this article.

Windows ME/XP/2003 have built in ZIP file support. It is therefore, very easy to make and extract ZIP files using these operating systems.