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'''JPEG Network Graphics''' ('''JNG''') es un [[formato gráfico]] basado en [[JPEG]] fuertemente relacionado con [[PNG]].
JNG wasfue createdcreado ascomo anun adjunctcomplemento topara theel [[Multiple-imageformato Networkde Graphics|imagen animada [[MNG]], animationpero format,puede ser butusado maycomo beun usedformato asindependiente ade stand-aloneningún formatotro. JNG files embed an 8-bit or 12-bit JPEG datastream in order to store color data, and may embed another datastream (1, 2, 4, 8, 16 bit PNG, or 8 bit JPEG grayscale image) for transparency information. Actually, a JNG may contain two separate JPEG datastreams for color information (one eight-bit '''and''' one twelve-bit) to permit decoders that are unable to (or do not wish to) handle twelve-bit datastreams to display the eight-bit datastream instead, if one is present.
Version 1.0 of the JNG specification was released on January 31, 2001 (initially as part of the MNG specification). Usually, all the applications supporting the MNG file format can handle JNG files, too. E.g., Konqueror has native MNG/JNG support, and MNG/JNG plugins are available for Opera, Internet Explorer, and Mozilla Firefox. The Mozilla Application Suite (and hence Netscape) originally supported MNG/JNG, but native support was removed in Mozilla 1.5a by developers and Mozilla has not supported the format since, despite requests from its users. Safari does not support MNG/JNG.