We prefer Adobe Illustrator .Ai files with an artwork layer and an outline out layer that indicates the cut shape of the sticker. The outline layer will be the cutout shape of your sticker. Please make this cut line a minimum of .25pt. Please ensure that your image resolution is 300dpi or higher. We accept both CMYK and RGB File types for printing.
Follow the link to our blog where we have an in depth tutorial on how to do this properly!