Go to File > Info > Protect Document > Encrypt with Password. Type a password, press OK, type it again and press OK to confirm it. Save the file to make sure the password takes effect.

How to protect an Excel file using a password to prevent unwanted access to your data.

You can add a password to an Excel file to prevent unauthorized users from opening or modifying it.

You can add a password to an Excel file to prevent unauthorized users from opening or modifying it.

You can add a password so that only authorized users can modify a presentation. Unauthorized users can still open the presentation and then save it by using a different file name.

Add a password to protect your entire workbook and control whether others can open or make changes to it. Protect your file by setting passwords for Open and Modify.

A password can be set for an Outlook Data File (.pst) to help prevent unintentional intrusion by other people who share your computer. When a password is used, a password prompt appears when …

In this topic we’ll discuss the various ways you can utilize the primary options to protect and distribute your Excel files.

If people open your project file, they may accidentally change task status, deadlines, or other critical information. You can prevent that by adding a password to the file when you save it.

This article explains how to encrypt an Access database by using a database password, and how to decrypt a database and remove its password.