Add passwords if you want Excel to prompt for a password before allowing a user to open or modify the workbook file.

If you want to set an expiration date and password when sharing Excel files online, here is how you can do that. It is possible to do both of them when using Excel Online.

Setting a password on your Excel spreadsheet is a great way to keep it secure, but can be annoying if you're opening the same file often.

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.

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.