Reset your PC or got a new one? You usually don’t need to buy Office again. Here’s how to reinstall it.
If it’s linked to your account
Sign in at the Microsoft account portal, find Office under your products, and download the installer. Activation follows your account.
This is the easiest path — no key needed.
If you have a product key
Redeem your key on the Microsoft setup page to attach the license to your account, then download and install.
Keep your key recorded for situations like this.
Install and activate
Run the installer, open an Office app, and sign in with the licensed account to activate.
Your previous documents are unaffected by reinstalling the apps.
Frequently Asked Questions
Do I have to buy Office again after a reset?
No — reinstall via your Microsoft account or redeem your key.
Where do I download it?
From your Microsoft account’s products/install page.
Will I lose my files?
No — reinstalling the apps doesn’t delete your documents.
Reinstalling from your account
After a PC reset, sign in at office.com with the Microsoft account tied to your license, go to Services & subscriptions, and download the installer again. Your license is remembered by the account, so nothing is lost.
For a perpetual license that was redeemed to your account, the same download-and-sign-in flow restores it.
Reactivating
Open any Office app after installing and sign in — activation is automatic when the account matches your license. If you used a standalone product key, re-enter it at setup.office.com if prompted.
Keep your Microsoft account details and, for perpetual licenses, your product key stored safely for exactly these situations.
Do I need to buy Office again after a reset?
No — reinstall from your Microsoft account; the license is retained.
How do I reactivate?
Sign in to Office with the account tied to your license, or re-enter your product key if asked.
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