Microsoft Product — Key Checker

For Office, run cscript ospp.vbs /dstatus to get detailed error codes.

A Microsoft product key checker is a vital tool for verifying the legitimacy and activation status of licenses for products like Windows and Office. While Microsoft does not offer a single standalone "universal checker" for consumers, there are several official and reliable methods to validate your 25-character alphanumeric key. Official Verification Methods microsoft product key checker