All images should not exceed 5000px or 20mb
Shopify Recommended Specs
NOTES & CONSIDERATIONS FOR ALL HOMEPAGES
Visual variations are unavoidable based on screen sizes, if the subject needs to be seen at all times you need to have somewhere around 150-200px left/right and 200-300px up/down to ensure cropping doesn't 'eat' the subject. Most platforms, including Shopify and other responsive website builders, automatically crop and scale images with the center as the focal point. This approach keeps the middle of the image prominent, but it may cut off parts near the edges, depending on the screen size.
Position the Key Subject in the Center: When designing images, ensure that the main subject or critical content is placed in the center to keep it visible on all screen sizes.
Avoid Placing Important Elements Near the Edges: Leave the edges of your image clear of vital details, such as text or key parts of the subject, as these areas are more likely to be cropped out.
Example - Zara