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The PNG Group has put together a comprehensive collection of tools designed to help make the implementation of the PNG format a relatively easy task. Included is the PNG Specification, PNG Library (libpng API), Compression Library (zlib), and a test suite of PNG images. These tools are provided without cost and can be used freely in commercial and non-commercial products*.

* Copyright notices and disclaimers are included with these tools to protect the authors.

PNG Specification
v1.0, (pngspc10.zip, 69k)

PNG Library API
libpng v0.89c (lpng089c.zip, 129k)

Compression Library
zlib v1.04 (zlib104.zip, 106k)

PNG test suite of images
pngsuite (pngsuite.zip, 87k)

Group 42, a contributor to the PNG effort, will work to ensure that the most updated PNG specs and tools are provided at our web site, however, we cannot provide any PNG information or support via telephone or email.

PNG support can be obtained via email at png-info@uunet.uu.net. An additional suite of test images can be obtained at ftp.uu.net/graphics/png.

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