Options vary based on the type of image, but for many of its wallpapers, there is a multitude of choices, including many resolutions for dual- or triple-monitor setups, as well as 4K.

For example, if one monitor's resolution is 1360-by-768 and the other screen's resolution is 1280-by-768, add 1360 and 1280 for a final resolution of 2640-by-768.