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PNG(5) File Formats Manual PNG(5) NAME png - Portable Network Graphics (PNG) format DESCRIPTION PNG (Portable Network Graphics) is an extensible file format for the lossless, portable, well-compressed storage of raster images. PNG pro- vides a patent-free replacement for GIF, and can also replace many com- mon uses of TIFF. Indexed-color, grayscale, and truecolor images are supported, plus an optional alpha channel. Sample depths range from 1 to 16 bits. PNG is designed to work well in online viewing applications, such as the World Wide Web, so it is fully streamable with a progressive dis- play option. PNG is robust, providing both full file integrity check- ing and fast, simple detection of common transmission errors. Also, PNG can store color space data for improved color matching on heteroge- neous platforms. SEE ALSO libpng(3), zlib(3), deflate(5), and zlib(5) Portable Network Graphics (PNG) Specification (Third Edition): W3C Recommendation 24 June 2025 https://www.w3.org/TR/2025/REC-png-3-20250624/ Portable Network Graphics (PNG) Specification (Second Edition): ISO/IEC 15948:2004(E) https://www.iso.org/standard/29581.html W3C Recommendation 10 November 2003 https://www.w3.org/TR/2003/REC-PNG-20031110/ Portable Network Graphics (PNG) Specification Version 1.2: Published by the PNG Development Group on 14 July 1999 https://www.libpng.org/pub/png/spec/1.2/ Portable Network Graphics (PNG) Specification Version 1.1: Published by the PNG Development Group on 15 February 1999 https://www.libpng.org/pub/png/spec/1.1/ Portable Network Graphics (PNG) Specification Version 1.0: IETF RFC 2083, March 1997 https://www.ietf.org/rfc/rfc2083.txt W3C Recommendation 1 October 1996 https://www.w3.org/TR/REC-png-961001 AUTHORS This man page: Glenn Randers-Pehrson, Cosmin Truta, Chris Lilley. PNG Specification (Third Edition): Chris Blume et al. PNG Specification (Second Edition): David Duce et al. PNG Specification Version 1.2: Glenn Randers-Pehrson et al. PNG Specification Version 1.1: Glenn Randers-Pehrson et al. PNG Specification Version 1.0: Thomas Boutell et al. December 5, 2025 PNG(5)
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