Do note that the name given to the activation codes is rarely “Steam Key” when you’re buying from a different retailer and it may be labeled “Digital Activation Code”, “Product Code”, or some variation there of. On the next page of the activation wizard, enter your product code in the slot and click “Next”. On the next screen agree to the terms of service by clicking “I Agree”. On the first page of the wizard, you’ll be prompted to get your code ready, click “Next” when you’re ready. You could even access this website from your phone.
The website works basically the same as the Activate a Product on Steam option in the Steam client, but it can be used even if you don’t have Steam installed on your current device. Enter the product key here and go through the wizard. To redeem a code via the Steam website instead, head to the Activate a Product on Steam page and sign in with your Steam account. To redeem a code in the Steam application, open Steam on your computer and from the top navigation bar, select “Games” and then “Activate a Product on Steam…” to start the product activation wizard. You can either redeem codes on the Steam website or via the Steam desktop application. In order to add games purchased through a third party to your Steam account, you’ll need the activation code from the third party retailer.
