JPG is usually smaller for photographs, scans, and complex artwork with many colors. Converting can make publishing easier when transparency and lossless editing are no longer required.
PNG transparency cannot survive in JPG. This tool composites transparent areas onto white before export, so inspect logos, cutouts, shadows, and light edges carefully.
A sensible production check starts with one demanding source: inspect fine edges, skin or product texture, gradients, text, and the final background at the size people will actually see. Compare output weight with visual quality instead of assuming the smallest file is automatically best. Keep original PNG masters outside the converted folder, because a JPG delivery copy is not a substitute for editable source material. For recurring catalog or publishing work, record the chosen quality and naming pattern so future batches remain consistent. This repeatable check is especially useful for smaller photographic output, where a technically valid file can still be unsuitable if compression, background handling, or naming does not match the destination.