Free ToolsWindows Product Key Checker
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Windows Product Key Checker

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.

Check a key’s format

Paste a product key below. We’ll clean it up and confirm whether it has the correct 25-character structure.

Find your key & check activation

Use these built-in Windows commands. Open Command Prompt or PowerShell as administrator, then paste a command.

Find the key stored in your PC’s firmware (OEM key)
wmic path softwarelicensingservice get OA3xOriginalProductKey
Run in Command Prompt. Works on PCs that came with Windows pre-installed. Returns nothing if no firmware key exists.
Same, using PowerShell
(Get-WmiObject -query 'select * from SoftwareLicensingService').OA3xOriginalProductKey
Run in Windows PowerShell.
Check whether Windows is activated
slmgr /xpr
Shows a pop-up telling you if Windows is permanently activated.
See detailed license / activation info
slmgr /dlv
Shows the license status, partial product key, and activation details.

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Frequently Asked Questions

No. Only Microsoft’s activation servers can confirm whether a key is genuine and unused. This tool only checks 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 in firmware — run “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.