API endpoint -
size (required) - new size (in pixels) of the image in the format
WIDTHxHEIGHT. You have to specify both dimensions width and height.
dppx (optional) - Number of dots per pixel defines the ratio between device and CSS pixels. The query parameter is a hint that enables extra optimisations for high density screens. The format is a float number in the same format as window.devicePixelRatio.
size=200x100- scaling by the smaller side which is height, cropping sides, center positioning
dppx=2- sending a hint to the API that screen has DPI=2
You can see URL of the examples by "right-click -> Copy Image address"