There are several options available to you to protect your Excel file with a password. Remember that once you protect the Excel file, you cannot open it without entering the password.

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.

If you want Excel to prompt for write access, enter a password in the "Password to modify:" field. Click the "OK" button to close the dialog box and then click "Save" to save the file with the ...

How to lock cells in Microsoft Excel, so you need a password to change or erase data ...