You can upload images of most formats. You can also upload PDF. There is another file format which is Wiztut own format called WMO. Any page of whiteboard which has been saved in a WMO file, can be uploaded back onto the whiteboard. This format enables you to save the whiteboard with all of the objects and canvas drawings and images exactly as they are when you are teaching. So that by uploading a WMO you can return the whiteboard to exactly the status how it was when you ended your lesson.