PNG(5)

💖 PNG(5) — the png manual page, but make it make sense ✨

okay bestie, so this is the png page from the File Formats Manual section. it's about the Portable Network Graphics (PNG) format and no cap, it's iconic. let's get into it 🦋

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✨ NAME ✨

png — Portable Network Graphics (PNG) format 💅

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🌸 DESCRIPTION 🌸

okay so PNG, aka Portable Network Graphics, is an extensible file format for storing raster images in a way that's lossless, portable, and ✨well-compressed✨. and the way that it does all three at once?? obsessed. 😭

here's the tea: PNG is a patent-free replacement for GIF. periodt, no licensing drama. and she's flexible enough that she can also replace lots of the common uses of TIFF too. versatility 👑

she supports:

• indexed-color images
• grayscale images
• truecolor images
• plus an optional alpha channel (transparency babes 💜)

and sample depths range from 1 to 16 bits. from teeny tiny to full glow-up. 💅

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PNG is literally designed to work well in online viewing applications, like the World Wide Web, so she's fully streamable with a progressive display option. meaning she shows up early and fills in the rest. main character energy, honestly. 🫶

she's also robust, which here means:

• full file integrity checking ✅
• fast, simple detection of common transmission errors ✅

so if something got scrambled in transit, she WILL tell you. no gaslighting. 🙈

and one more thing — PNG can store color space data for improved color matching on heterogeneous platforms. so your colors look right whether you're on your laptop, your phone, or some cursed embedded thing. 🌈

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🔥 SEE ALSO 🔥

go read these too bestie, they're the whole ecosystem:

• libpng(3)
• zlib(3)
• deflate(5)
• zlib(5)

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📜 the actual specs, in all their official glory 👑

💖 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

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🫶 AUTHORS 🫶

give it up for the people who actually made and documented all this, fr fr 👏

• 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.

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ok that's the whole page bestie, you read it, you understood it, you ate. 💅✨

and for the cute sign-off: this version came from the PNG(5) page dated September 28, 2026 🌸 thanks for reading, mwah 💖🎀🦋