To prevent others from accessing data in your Excel files, you can protect your Excel file with a password. Watch this video to learn how.

1. Select File, then Info.

2. Select the Protect Workbook box and choose Encrypt with Password.

3. Enter a password in the Password box, and then select OK.

4. Confirm the password in the Reenter Password box, and then select OK.

To learn more: https://support.microsoft.com/en-us/office/protect-an-excel-file-7359d4ae-7213-4ac2-b058-f75e9311b599

Warning:

- Microsoft cannot retrieve forgotten passwords, so be sure that your password is especially memorable.

- There are no restrictions on the passwords you use with regards to length, characters or numbers, but passwords are case-sensitive.

- It’s not always secure to distribute password-protected files that contain sensitive information such as credit card numbers.

- Be cautious when sharing files or passwords with other users. You still run the risk of passwords them falling into the hands of unintended users. Remember that locking a file with a password does not necessarily protect your file from malicious intent.