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.

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

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

Add password protection to a file. Select File > Info. Select Protect Presentation > Encrypt with Password. In the Password box, enter the password you'd like to use. Select OK. PowerPoint …

File encryption: When you choose this option, you specify a password and lock the Excel file. This prevents other users from opening the file. For more information, see Protect an Excel file. …

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

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 …

Add a password to a section in your notebook. When your protect a notebook section with a password, all of its pages are locked until you enter the correct password. Right-click the name …

Password protection in OneNote is designed to help keep your notes private. Audio and video recordings are stored as separate files in your notebook and you cannot apply passwords to …