Free License Key Format Checker
Verify the format of Windows, Office, Adobe, Steam, JetBrains, antivirus and more software license keys. Free, no signup, instant.
Your key never leaves your browser. 100% client-side.
Common formats
- XXXXX-XXXXX-XXXXX-XXXXX-XXXXX— Microsoft Product Key (Windows / Office)
- 00000000-0000-0000-0000-000000000000— GUID (Microsoft Volume / MAK)
- 0000-0000-0000-0000-0000-0000— Adobe Activation Code
- XXXXX-XXXXX-XXXXX— Steam Wallet / Game Code
This tool checks the format only. It cannot verify if a key is genuine, unused, or activatable. For guaranteed working keys, buy from trusted resellers like VendKeys.com.
Why use this tool?
- Confirm a key looks like the right format before purchase
- Identify which software a key belongs to
- Spot obvious typos or fake keys
- 100% client-side — your key never leaves your browser
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