Please try and cap your image size at 640 x 480. This isn't necessary, but preferred. Images that are too large will be resized and cropped at our discretion to get you what you want. We will not work with illegal, offensive or otherwise obscene images. BMP's are accepted if you cannot convert them to anything else.
Most volunteers can work with and convert a wide range of filetypes.
If you have an unusual file type, ask a volunteer about it. The rest of the requirements are negotiable, not everyone has the ability to convert or change image sizes to send to us, and we understand. These are just the preferences of the volunteers.