PNG supports transparency
PNG is useful for logos, interface screenshots, icons, and graphics that need transparent areas. It can preserve sharp edges and flat colors well.
PNG files can be larger than JPG when the image is photographic or very detailed.
JPG is better for many photos
JPG is usually practical for photos because it can produce smaller files at acceptable quality. It does not support transparent pixels.
When converting PNG to JPG, choose a background color for transparent areas so the result is predictable.
A common misconception
Converting JPG to PNG does not improve the original image quality. It only changes the file format.
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FAQ
What happens to transparent PNG areas in JPG?
They are flattened onto a background color because JPG does not support transparency.
Is PNG always higher quality?
No. PNG can preserve certain graphics well, but it does not improve a low-quality source image.