BF3 Borderless 1.2

BF3 Borderless allows you to play Battlefield 3 in a borderless "fullscreen" window, allowing you to easily and conveniently Alt+Tab to other applications. It gives you control over the window that Battlefield 3 runs in. If you wish, you can leave BF3 Borderless running in the Windows system tray. It will then apply your window settings to Battlefield 3 whenever you run the game.

You can resize the game window to any exact size that you want or automatically centre the game on your screen, if you want.