The files that will work best are vector based graphics, which come in the .eps or .pdf form. Unfortunately, most people do not have access to files to create vectors (which are essential in sign making), and we have to recreate or actually redraw your image.
What we accept for sign making, in order of preference: Adobe Illustrator eps or pdf files, other folks eps files. High resolution jpeg or tiff files.
Also, include the support files: such as fonts, pictures, etc that make up the entire file