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  1. Click the File tab.

  2. Click Info.

  3. Click Protect Document, and then click Encrypt with Password.

  4. In the Encrypt Document box, type a password, and then click OK.

  5. In the Confirm Password box, type the password again, and then click OK.

    NOTE: When you encrypt a file using Office 2016, the default encryption method is AES-256

    NOTE: Never email the password to the file in the same email. Either relay the password over the phone or send it in a separate email. using other means like a text message. Do not email the password to the recipient.

    NOTE: If you lose or forget a password, Excel cannot recover your data.