Why convert PNG to JPG?
PNG files are lossless and support transparency, but they can be huge — sometimes 5×–10× larger than the equivalent JPG. If you don't need transparency, converting to JPG can shrink your file dramatically with no visible quality loss.
For PNGs with transparent backgrounds, pick a background color above (white works for most cases) — that color will fill the transparent areas in the final JPG. Convert any number of files at once and download them as a ZIP.