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Encrypt Word files using Microsoft Word in Mac OS X

  1. With your document open, from the Word tab select Preferences.
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  2. From the "Word Preferences" dialogue box, click on the Security icon located under the "Personal Settings" options.
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  3. From the "Security" dialogue box, enter your desired passphrase in the "passphrase to open:" field.  It is recommended that you use a strong password or passphrase.  Once finished, click OK.Encrypt Word Mac 3
  4. You are now prompted to confirm your passphrase by reentering it.  Once finished, click OK
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  5. As the file is now encrypted, the passphrase will be required to open it.