Images used in the file must not exceed a maximum height of 500 pixels. Larger images may not be processed and displayed correctly by some readers.

It is important that the size of the images in your eBook are within the specified limits to ensure that the eBook displays optimally on different readers. Images that are too large can not only cause display problems, but can also slow down the page loading of the eBook. This can have a negative impact on the reading experience and make it less enjoyable to use.