JPG, PNG and WEBP — convert any direction
JPG → PNG: when you need transparency support or lossless quality. PNG → JPG: to shrink file size for photos (JPG compresses much smaller). → WEBP: the modern format that beats both on size for the web. When converting to JPG, transparent areas are filled white since JPG has no transparency.
Conversion happens on the canvas in your browser — your images stay private.