WHAT SIZE PHOTO CAN YOU USE......
Barbara B. asked on Apr 8, 2013
They prefer your files to be sent in a jpeg or tiff format with a resolution of 150 dpi and at least 2MB in size. If unsure, you can try Canvas on Demand's Personal Shopper service.
Just go here and fill out the information and they'll take a look at your image and within 24 hours give you feedback right to your inbox.
George from Groupon replied on Apr 9, 2013