10MB is the maximum size limit for uploaded pictures.  For most people, this won't be a problem—images from just about every smartphone and point-and-shoot camera will be under 10MB.  However, images from high-end digital cameras that haven't been resized or compressed may be larger than this limit.

If you have a larger image that you’d like to use, you can resize or compress it on your computer using common image editing applications, or even using the built-in image preview applications on Windows and Mac. 

If you try to upload a photo that is too small, you’ll receive the following message:
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Photos smaller than 1MB do not print well and cannot be enlarged, so we recommend using a different image. If it's a scanned version of a physical photo, re-scanning the photo at a higher resolution should solve this issue. 

If you do not have access to a scanner, Google's PhotoScan app takes multiple photos of an image and then stitches them together to create a high-quality photo. 

If those options aren't suitable, feel free to contact our customer support team and we’ll be happy to help you out.