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Lock Cells. You can lock cells in Excel if you want to protect cells from being edited. In this example, we will lock cell A2. Before you start: by default, all cells are locked. However, locking cells has no effect until you protect the worksheet. So when you protect a worksheet, all your cells (=worksheet) will be locked.
Excel offers the option of protecting the entire document, individual objects, structure of a window, and/or specific cells. With Excel, you can even add a password to the file. If you want to prevent changes to sheets or cells, you need to lock the cells and then protect the sheet.1  Protection Options. 2  Locking & Unlocking Cells. 3  Workbook Level Protection. 4  Worksheet Level Protection.ith Excel, you can even add a password to the file. If you want to prevent changes to sheets or cells, you need to lock the cells and then protect the sheet. 1  Protection Options. 2  Locking & Unlocking Cells. 3  Workbook Level Protection.