Each of our products have a recommended resolution so that an image can be optimally displayed as a full bleed, without worry of degradation in print. To find more information on the recommended resolution for a specific product, click here: Photo Books, Cards, Calendars, Canvas Prints, or Photo Panels.
Of course not all your images must be the optimal sizes, but keep an eye out for images that display a Low Resolution Warning, as they will not print well in the space they have been assigned.
You can check the resolution of your images on your computer (not in the editor)
On a Mac: File > Properties
On a PC: Right click on the image > Properties > Details
How do I know how big I can make make my photo?
The Low Quality indicator noted above will tell you if the photo's resolution is too low to print clearly, but if you have an image you know is a certain dpi (sometimes referred to as ppi) and you want to know approximately how big you can print that image so it will be as clear as it can be, just divide each dimension by 300 to get the approximate size of the image.
For example, a 1200 x 1800 image will be able to be printed at 4" x 6".
Please note: Low resolution is one of several reasons an image can be blurry. Movement, focus, and lighting can all contribute to the clarity of an image.