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.

Encryption is the process of converting data into a code to prevent unauthorized access. In Windows, this can be achieved using built-in tools that allow you to encrypt files and folders, …

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.

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

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

Depending on your organization or account, Outlook may allow you to encrypt your message with S/MIME or Microsoft Purview Message Encryption. Any time your message includes a digital …

This article explains how to encrypt a database by using a database password, and how to decrypt a database and remove its password. In earlier versions of Access, you could create …

Sheet and workbook element protection should not be confused with workbook-level password security. Element protection cannot protect a workbook from users who have malicious intent. …

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

Send S/MIME or Microsoft Purview encrypted emails in Outlook using a work or school account with a qualified Microsoft 365 subscription.