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.

Here is a tutorial to lock or hide only the formula cells in an Excel workbook. You can also lock formulas in all worksheets in a workbook.

The ability to lock cells or elements of Microsoft Excel and Google Sheets, but not the full sheet, allows maximum customization and control of a project.

Locking cells in a Microsoft Excel spreadsheet is among the most commonly used functions. Here’s a guide on how to lock cells in Excel.