When I create an image, I use the no border document type. I resize the page to the size of the image and save it as a PNG. When I upload it to a program, I keep seeing the bottom and the right border of the image, even though I don't see them in the original inkscape file.

Note: I've deselected the "show page border" and "show shadow" boxes, although I don't think that has anything to do with it.