How to find Windows 8 product key?

Solution 1:

I have been using Nirsoft's ProduKey. It works with Windows 8.

ProduKey is a small utility that displays the ProductID and the CD-Key of Microsoft Office (Microsoft Office 2003, Microsoft Office 2007), Windows (Including Windows 7 and Windows Vista), Exchange Server, and SQL Server installed on your computer.

Solution 2:

A utility has been released over at mydigitallife.info for this purpose

Windows 8 Product Key Viewer works for both version of Windows as 32-bit and 64-bit and it can

Decodes Windows Product Keys.
Decodes product keys with N character.

Solution 3:

Recover-Keys seems to be updated to work with Windows 8. It has always been my go to Utility for recovering Product keys.