How to encrypt a PDF on Mac OS Preview, the Mac OS application that opens most popular file types, has many bonus features for modifying documents. One of them is encrypting PDF files.

How to Merge Encrypted PDF Files. Small businesses working with sensitive PDF documents may choose to encrypt those documents. An encrypted PDF is password protected, which means you cannot open ...

Have a private document on your desktop OS? Here's how to keep it secure on Linux, MacOS, and Windows.

Once set, click the Protect PDF button, and your document will be encrypted, ensuring that only those with the password can access it.

After choosing Print to PDF and opening in Preview, save the document and click the Encrypt option (circle). Then send the encrypted PDF using the Share button (arrow) as an e-mail attachment ...