To lock cells so only one person can edit, you need to use a password. For that, open the sheet and go to the Review tab. Click on the Protect Sheet option and enter a password.

Remember that, with password protections removed, anyone with access to your Excel file can open, view, and edit it. If you've decided a password isn't necessary anymore, this likely isn't an issue.

Make sure that no one else can edit a document by making it read-only. In Word, click the File menu. Select Info > Protect Document to view your security options. Select Always Open Read-Only.

If you are opening an Excel file that has been saved before, you can still protect it with a password by following the first method. If you want to restrict users from editing your Excel file, you ...

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.

Microsoft Excel lets you embed content from other applications, including PDF files. You can embed a PDF file into a cell of an Excel worksheet and then use Excel's security features to lock the ...

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.