PNG supports transparency, so the icon's transparent background is preserved. JPG would fill it with white.
Modern browsers accept PNG favicons. However, ICO is still recommended for maximum browser compatibility.
The largest image size stored inside the ICO file is used for the PNG output.
Yes. PNG with transparency is ideal for logos on websites. It works on any background colour.
The largest size stored in the ICO is used for the PNG output.
Yes. PNG is supported by all image editors including Photoshop, GIMP, Affinity Photo, and Canva.
ICO can store multiple sizes in one file and has the widest browser support. PNG favicons are supported by modern browsers but may not work in very old ones.