Any picture you wish to upload to the design studio must be in digital format. JPEG (.jpg, .jpeg), PNG, GIF, Bitmap (.bmp) or TIFF formats are acceptable. The minimum file size should be at least 50KB in size and at least 840 X 840 pixels. You cannot upload an image that is less than 840 pixels along its smallest side. The maximum file size cannot exceed 10 megabytes (MB).
How to find image properties:
PC users can usually find file format, size and pixel dimensions by right-clicking on the file and selecting Properties
Mac users can usually find pixel dimensions by clicking on the file and selecting Get Info (the method for finding this information will vary depending on your individual operating system) – see the Image Upload Guidelines for additional information