The following are the recommended settings for creating images for your products within the webstore.
The sync will allow for product images to be in the following formats:
.jpg, .JPG, .JPEG
.gif (The site will convert it to a jpg once uploaded)
We don't allow images over 1MB and usually most JPG images should easily be compressed to as low as 250 - 500KB (this can easily be done within Photoshop or a free image editor such as GIMP and many others).
If the image is larger than 1MB - this can potentially cause issues with the sync as well as how the image displays online - so best practice is to keep it smaller.
Width Vs. Height
The image dimensions should be no more than 1,000 x 1,000 pixels in height and width.
They can be smaller than, but there is really no reason for them to be any bigger, due to how images are displayed within websites and web browsers, even modern 4k screens still wouldn't display it properly.
Users can make your images rectangular, however we recommend they are square. This will keep it consistent for all your products. Add white space around the image if the image cannot be saved as a square.
If you have a real need to use rectangular images, then all your images will need to be the same ratio of height x width, otherwise your products will show-up either out of alignment on the product listings, or else some of your images may appear much smaller than others.
Adding white space to make a square