The maximum allowed width of the output image.
Must be an integer greater than
0. This parameter will only work if
fit=crop is present.
This feature is particularly useful for horizontally-scrolling feeds that display user-uploaded images. By specifying a maximum width for each image, users are prevented from accidentally (or intentionally) breaking the user experience of the site or app by uploading incredibly wide, short images.
See the API specification for more information about this parameter's value ranges and format.