Any image file can be converted to a GIF utilizing most photo editing software. Keep in mind that most images will need to be compressed for this, and you will likely lose quality during the conversion. Your photo editing software may allow you to specify a form of dithering to help lessen the visible loss of quality as result of the compression. If you want to create an animated GIF, there are several programs available online that will allow you to convert a short video clip into GIF format. Some sites are also available that will allow you to convert a stationary image into an animated GIF. Or, if you are more artistically inclined, you can use animation software to create your own GIF animations.