Welcome to libpng.org!

Home of

Portable Network Graphics
(PNG image format)

Multiple-image Network Graphics
(MNG and JNG image formats)

and, of course,

libpng
(the free reference library for reading and writing PNGs)

libpng.org is maintained by Greg Roelofs on servers provided by SourceForge. Different parts of it are mirrored in various locations around the world; see the PNG and MNG home pages for details. There is also a completely separate site for the free MNG library, libmng.