Please refer to this chart to determine the minimum image size you need to produce quality prints

NOTE: If a photo doesn't meet these minimum image-size requirements, you should indicate to the customer in their cart that the image is invalid. To avoid receiving a low-quality print, and the customer cancelling the order we recommend against ordering prints with image resolutions less then the below for the follow products:

Please make sure images are 300 DPI

Print Size/Product Minimum Image Resolution
4x6 Prints 540x360 pixels
5x7 Prints 630x450 Pixels
8x10 Prints 900x720 pixels
11x14 Posters 1008x792 pixels
12x18 Posters 2682x1788 pixels
16x20 Posters 2980x2384 pixels
20x30 Posters 4470x2980 pixels
24x36 Posters 5400x3600 pixels
2x6 Banner 1800x1440 pixels
2x8 Banner 1800x1440 pixels
4x8 Flat Cards 640x426 pixels
5x7 Flat Cards 640x480 pixels
5x7 Folded Cards 840x600 pixels
5x7 Flat cards 840x600 pixels
Custom Cover Photo Books 1280x1024 pixels
8x10 Canvas 710x768 pixels
11x14 Canvas 994x781 pixels
12x12 Canvas 852x852 pixels
16x20 Canvas 1420x1136 pixels
20x24 Canvas 1740x1420 pixels
20x30 Canvas 3000x2000 pixels