Protect an Excel file
To prevent others from accessing data in your Excel files, protect your Excel file with a password.
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Select File > Info .
Info
Info
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Select the Protect Workbook box and choose Encrypt with Password.
Encrypt Password
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Enter a password in the Password box, and then select OK .
Password Box
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Confirm the password in the Reenter Password box, and then select OK .
Re-enter password
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