Size does matter.
When you submit your images for printing we carefully review each one and compare it to the minimum size required to make a good-looking print. If your photo’s resolution is too low to print well at any size, we’ll let you know by flagging it with an indicator in the album, and you won’t be able to place a print order for that image. Sorry, but we just can’t produce a bad print.
The minimum resolution that we will print is 100 dpi (dots per inch) for prints and 150 dpi for photo books. However, if you really want the best possible print quality (and who doesn’t?) we recommend 300 dpi. It works like this: the lower the resolution, the less detail is contained in your image. Large prints of images with low resolution appear blurry and blocky, kind of like the people on the TV news who don’t want their faces shown. Not a good look.
For tables and details about resolution check our post on Resolution and Image Quality.