JPEG, PNG, GIF, or TIFF files.
T-shirts designs are created using minimum of 150 DPI.
To fill the full area, we recommend that you use images that are equal to or larger than the recommended sizes below. For images smaller than these sizes, you should not fill the full area, but will have additional "white space"
Vertical 12" x 14" 1800 x 2100 pixels
If your image is bigger than these sizes, it'll turn out even better since it will be printed at an even higher resolution than the minimum.