Can I activate microsoft office for free without product key?

The online version of Microsoft Office (Office.com) is completely free to use with some limitations. 

How to activate office for free without product key

Go to Office.com and sign in with a Microsoft account.

Access free web versions of Word, Excel, PowerPoint, and OneNote.

No activation required, but you need an internet connection.

Features & Limitations of Free Office Online
✔ Free for personal use – No subscription required.
✔ Basic editing & formatting – Works well for documents, spreadsheets, and presentations.
✔ Cloud storage – Files save to OneDrive (5GB free).
✔ Real-time collaboration – Share and edit with others.

❌ No advanced features (e.g., Mail Merge, Advanced Excel functions, Offline Access).
❌ Requires internet – No full desktop app functionality.
❌ Smaller OneDrive storage (compared to Microsoft 365).

P.S. A few third-party tools let you activate microsoft office for free without product key.