Your artwork file should be exact size 18x24 at 150dpi in RGB color mode with all of the text and images that you dont want cut off 1/4" away from the edges. Only upload JPEG files
 
Artist Grade Canvas | Patented Design | 1.25” Depth | Finished Backing | Corner Bumpers | Metal Screw Fasteners. Ships in 4 business days. Shipping is FREE!