1. First download Steam Key Generator and Open it.
2. Choose a Game.
3. Generate the game key you want
4. Now Copy the Key and Go to steam.
5. Click Add a game ► Active a product on steam ►
6. Past the key and active it
7. Have Fun!
Its server side and undetectable so You can’t get ban from Steam.You don’t need to put Your email and password. I saw many other fake “generators/adders” they are keyloggers or steam stealers. If You dont believe that this tool is working, and You may think this is scam or keylogger, just make new Steam Account and try this software out