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.

Crisis averted–kind of. Permission to copy the entire workbook is another problem. For instance, if you open a protected Excel file in the browser edition, you can see hidden formulas.

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 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.

Safeguard your Excel worksheets from accidentally deleting formulas or data sets by locking important cells, while leaving the rest of the worksheet editable.

Sending Excel files containing crucial financial and business data has risks. To add a layer of protection, you should learn to password protect an Excel file.

What if you want to lock some cells on your worksheet but not the entire worksheet? In Microsoft Excel, you can lock a specific cell or cells from people trying to edit essential information in them.

Want to protect an important Word document or Excel spreadsheet? Here's how to add a password, make documents read-only, and tap into other tricks to safeguard sensitive files.