By David Buchanan, 16th of January 2023 PNG is my favourite file format of all time. Version 1.0 of the specification was released in 1996 (before I was born!) and the format remains widely used to this day. I think the main reasons it stuck around for so long are: It's "Good enough" at lossless image compression. It builds on existing technologies (zlib/DEFLATE compression). It's simple to implem