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How do I Activate office via product key?

To activate office via product key, enter the unique product key provided during installation or purchase on Microsoft365.com/setup. This key validates your license, allowing you to access the full functionality of Office applications like Word, Excel, and PowerPoint.

Steps to Activate office via product key

  • Launch office.com/setup (e.g., Word or Excel).
  • Sign in with your Microsoft account or select "Activate" if prompted.
  • Enter the 25-character product key when prompted.
  • Complete the activation by following the on-screen instructions.
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Last modified: 2025-10-14Powered by