A product card needs a clear overall shape at a small display size. A detail view may need readable packaging text, visible stitching or a close look at a surface finish. One tiny export should not be expected to do both jobs. Keep the original photograph and prepare different delivery copies when your store supports separate listing and zoom images.
Before compressing, decide whether the product should fill the frame or retain space for a consistent catalog layout. Fit within preserves the whole photograph, including any existing background. Exact size crops the photo and may remove a handle, strap or edge. The tool does not add matching borders or remove a background. Make a consistent composition in the source editor when the store needs every product positioned on an identical canvas.