Validate the format of a Windows product key and learn exactly how to find your key and confirm activation.
This tool checks the format only.
It cannot tell you whether a key is genuine, unused, or able to activate Windows — only Microsoft's activation servers can do that. Use it to spot typos and confirm a key has the correct structure.
Paste a product key below. We'll clean it up and confirm whether it has the correct 25-character structure.
Use these built-in Windows commands. Open Command Prompt or PowerShell as administrator, then paste a command.
wmic path softwarelicensingservice get OA3xOriginalProductKeyRun in Command Prompt. Works on PCs that came with Windows pre-installed. Returns nothing if no firmware key exists.
(Get-WmiObject -query 'select * from SoftwareLicensingService').OA3xOriginalProductKeyRun in Windows PowerShell.
slmgr /xprShows a pop-up telling you if Windows is permanently activated.
slmgr /dlvShows the license status, partial product key, and activation details.
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No. Only Microsoft's activation servers can confirm whether a key is genuine and unused. This tool only checks whether a key matches the standard 25-character format. To confirm a key is genuine, enter it during Windows activation under Settings > System > Activation.
A Windows product key is 25 characters long, shown as five groups of five separated by dashes, for example: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX. It contains only letters and numbers.
If your PC came with Windows pre-installed, the key is usually stored in the firmware — run the command 'wmic path softwarelicensingservice get OA3xOriginalProductKey' in Command Prompt. If you bought a key separately, check your confirmation email or the card it came on.
Open Settings > System > Activation, or run 'slmgr /xpr' in Command Prompt. You'll see whether Windows is permanently activated.