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This article applies to Office Home & Business, Office Professional, and individually purchased Office apps. To switch an Office install to or from Microsoft 365, see Switch your Office license.

Change the product key for your version

How you change the product key depends on your version of Office. Select your Office version from the tabs below.

Best practice for multiple versions of Office

If you bought multiple copies of Office and used the same Install button to install Office on multiple PCs, activation fails on the other PCs. This happens because each Install button is associated with a unique product key that can only be installed on one PC. To fix this, you can change the product key for the other PCs where you installed Office.

Note: After you change your product key, we recommend that you create a list to manage the product keys that you've installed. To learn how, see Manage multiple one-time-purchase Office installs that use the same Microsoft account.

Most versions of Office 2024, Office 2021, and Office 2019 don’t include a product key and you only need to sign in with the account already linked to your Office license.

If your version did include a product key, follow the steps under the 2016 tab.

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