You can create an encrypted disk imager in Disk Utility. On Excel documents you must choose File>Passwords to access the Encrypt this item dialog. Open the Set a password to open this document item to set one. You can password protect Microsoft files in the Review tab using the Protect item at the top right of the toolbar. Tip: You can also password protect any item in the Print dialog box: Tap print, tap Save as PDF using the drop down item at lower left of the print dialog box and then click Security Options, check r equire password, enter and confirm that password and the document you create will be protected. You can disable this protection in a locked item by unlocking it, returning to the Save As dialog and unchecking the Encrypt box. Next time you want to open this item a password will be required. Enter the password you want to use in these boxes.
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You can also use Preview to lock PDF files (these don’t need to have been created in Preview). You’ll be asked to set a password, hit OK when you are done. Next time you open the document you’ll be asked for the password. You can also choose whether to open the item with Touch ID, or remember it in Keychain if you don’t have a Touch ID Mac. Enter and verify the password in boxes one and two and enter a password hint to help if you forget the code. Open the file you want to protect and choose File>Set Password. Pages, Keynote and Numbers files can easily be protected.
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