Free ToolsWindows Product Key Checker
Free Tool · No sign-up

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.

Need an original Windows or Office product key?

We sell original Microsoft product keys with instant delivery and lifetime validity — as an independent third-party reseller (not affiliated with Microsoft).

Browse product keys

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.