Computer-assisted image cropping

Implementations relate to computer-assisted cropping of an image. A computer-executed method includes receiving user input indicative of a change in size of a crop window from a first size to a second size, where the crop window is displayed over an image in an image editing user interface. The method detects that the crop window of the second size has an aspect ratio within a threshold range of a predetermined aspect ratio. In response to the detection, the method resizes the crop window to a third size, where the crop window of the third size has a resized aspect ratio substantially the same as the predetermined aspect ratio.