How to Activate Windows 11 for Free — Legitimately
"Free" here means no extra cost beyond what you've already paid — not third-party scripts or generic keys used outside their purpose.
"Free" here means no extra cost on top of what you've already paid — we won't cover third-party scripts or generic keys used outside their intended purpose, which violate Microsoft's licence terms and can be deactivated at any time without notice.
Option 1: transfer a Windows 10, 8.1 or 7 licence you already own
If you have a valid licence from an earlier Windows version (even from an old PC), you can use it to activate Windows 11 at no extra cost — it's your licence, you're simply applying it to the new system:
- Settings → System → Activation → "Change product key."
- Enter your previous licence key.
Option 2: a digital licence already linked to your account
If you previously activated Windows 11 on this same machine (or one with very similar hardware) using your Microsoft account, reinstalling and signing back in with that same account restores activation automatically the moment you connect to the internet — no key needed.
Option 3: upgrade from a genuine Windows 10
If you have a legitimately activated Windows 10, upgrading to Windows 11 through Windows Update is free and transfers the licence automatically, with no extra steps.
About what you'll find elsewhere: third-party KMS activation scripts, unofficial servers, or "generic keys" used for permanent activation on a personal PC aren't legitimate routes — they're keys meant for enterprise trial environments, and using them this way circumvents Microsoft's licensing system. Beyond the legal issue, many of these scripts are distributed bundled with malware.
If none of the above applies to you
Without a previous licence to transfer, the only legitimate route is buying one — through the Microsoft Store or an authorised reseller, not from sellers of loose keys with a dubious origin.
Frequently asked questions
Can I use a key from a very old Windows 7 or 8.1?
Yes, as long as that licence is still valid, Microsoft allows using it to activate Windows 11 — it's a transfer of your own existing licence, not a way to avoid paying.
Are generic keys or KMS activation scripts legal?
They're meant for enterprise trial or volume-deployment environments, not permanent individual activation — using them that way violates Microsoft's licence terms and can be deactivated without notice.
What happens if I reinstall Windows on the same machine where it was already activated?
If you previously linked your Microsoft account to the digital licence, activation is restored automatically when you sign in again with that account after reinstalling.