The left side and the right side are manipulated independently.
Specify the image to upload on the left side and/or specify the image pixel dimensions. Press the button. (Maximum image file size is 7.9 megabytes) Do the same for the right side.
Adjust dimension numbers as appropriate. Screen shot the result.
No cookie is used here. Your IP address is consulted for remembering your images. Images are removed from the server when it appears to us that you are done with them.
Note: Works better on desktop/laptop than on phones.