Tap the “Sign in” button (top right). Log in with your Steam credentials and Steam Guard code.
A: This often means the key requires a different Steam account region or is a beta/test key that expired.
Paste or type your activation key. Tap “Continue” .
Go to the Steam website: https://store.steampowered.com
While most PC gamers activate keys via the desktop client, the Steam mobile app (iOS/Android) is a convenient alternative—especially if you’re away from your computer or prefer managing your library on the go.
Once logged in, tap the hamburger menu (three lines) or your profile avatar → look for “Activate a Product on Steam” (sometimes under “Account” or “Store” submenu).
Log into the Steam mobile app.
Review the product name. Tap “Activate” .
Tap the “Sign in” button (top right). Log in with your Steam credentials and Steam Guard code.
A: This often means the key requires a different Steam account region or is a beta/test key that expired.
Paste or type your activation key. Tap “Continue” .
Go to the Steam website: https://store.steampowered.com
While most PC gamers activate keys via the desktop client, the Steam mobile app (iOS/Android) is a convenient alternative—especially if you’re away from your computer or prefer managing your library on the go.
Once logged in, tap the hamburger menu (three lines) or your profile avatar → look for “Activate a Product on Steam” (sometimes under “Account” or “Store” submenu).
Log into the Steam mobile app.
Review the product name. Tap “Activate” .