Free tool from Microsoft for IT pros:
Shows basic license status and partial key. microsoft license key checker
| Claim | Reality | |-------|---------| | “Check if a key works on any PC” | – Many keys (OEM) are tied to specific motherboard hardware IDs. A key may be “valid” but locked to another machine. | | “See how many activations are left” | Only possible for MAK (Multiple Activation Key) via Microsoft’s Volume Licensing Service Center (VLSC), not by any public checker. | | “Detect a stolen/leaked key” | Only Microsoft knows. A checker may show “blocked” if the key has been explicitly blacklisted. | | “Work offline” | No – the license status (especially grace period, non-genuine) requires contacting Microsoft’s servers. | Free tool from Microsoft for IT pros: Shows