In just a few clicks, you can protect your Word document from being opened by unauthorized people, prevent further changes from being made, or only allow a read-only copy to be made available. There are many reasons to protect your Word document, such as to enable safe document sharing, or simply because it contains sensitive information that should not be seen by unauthorized personnel. It can be extremely useful – vital in some cases – to password protect Word documents and protect them from prying eyes. You can password protect a Word document by going to File > Info > Protect document > Encrypt with password.