To encrypt an archive in 7-zip, once you’re at the Add to Archive dialog box, enter a password and select the Encryption method AES-256. You’ll find these options near the lower-right corner ...

First, double-click on the ZIP file to open it. Drag and drop new files into the ZIP file. This will automatically compress and add those files into the existing ZIP file. Read: Files copied from ...

If you need another option, create a password-protected archive containing the file or files that you need to keep safe. 7-Zip is a free tool for Windows that is able to build password-protected ...

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. If you use Outlook, you can use Adobe ...