The clearer the image the better it will print on the ball. Formats accepted are JPG, JPEG, PNG, and SVG. Minimal DPI required is 300. When the quality is not good, the customer is informed by a warning message that suggests uploading a better quality image. If the image appears blurry in the design tool then it will appear blurry on the final product. If you have any questions, please don't hesitate to contact us.