Why does SW Cards download an image smaller than the file I uploaded?

SW Cards asks HubSpot to deliver a responsive image close to the size the card needs instead of sending the full original file to every screen. That reduces download weight while keeping the image appropriate for its displayed size. Start with a sharp, compressed source image in a suitable web format and avoid uploading dimensions far beyond the card's likely use. If you are troubleshooting an older sample image, replace or reselect that image separately; it is not part of normal responsive resizing.