PK Finder is a free application that can help you recover your Windows Product Key in case you forgot it, are unable to access it or simply for testing purposes.

This application will only work for legitimately activated Windows devices.

The app takes no knowledge or ability, simply run PK finder and it will automatically display your product key. You can also copy it to your clipboard to paste in a document.

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Editor's Note:
MajorGeeks mirrors are the portable version.