If you have sensitive data you'd like to keep from prying eyes in a Microsoft Excel file, the easiest way to protect it is with Excel's built-in password tools.

You can add or remove a password from your Excel spreadsheets through the File tab. You'll do it slightly differently on a Mac and PC.

Microsoft Excel has several features designed to help you recover unsaved versions of files and prevent data loss.

At the file level, you can password protect an Excel workbook in two ways: You can determine who can get in and who can save changes.