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If you contact Steam support and tell them you are trying to check if a CD key is valid, Steam Support can tell you if they're valid or not. Just tell them you're trying to give a key to a friend and don't want to risk giving them a used key or whatever.
Validate multiple steam keys and generate txt files with the keys that have not been used and those that were used.
Steam Auto Cracker GUI is still marked a pre-release as it is relatively recent and untested compared to the console version. NOTE: A new config has been added, don't keep your old one, and let SAC generate a new one.
Golang. Checks if a Steam key can be valid using regex.
23 Νοε 2017 · You can attempt to use the key and it will either add the game to your account or tell you that you already own that product.
3 Σεπ 2014 · The only way to "check" a key is by trying to use it -- which will either tell you it's an invalid key, an already used one, or -- if neither of these -- it will redeem the key. But sure, send your keys to a "key checker". They will gladly take them. a developer can check keys for their own products.
26 Απρ 2015 · As the title says, I'm wondering if there's any way to check if a Steam key has already been used. In my experience Steam will display the same message if you try activating a key for a game you already own, no matter if the key is still valid or has already been used.
