libpng is the official Portable Network Graphics (PNG) reference library (originally called pnglib).

It supports almost all of PNG's features, is extensible, and has been widely used and tested for over 28 years.

[2] libpng is dependent on zlib for data compression and decompression routines.

It is frequently used in both free and proprietary software, either directly or through the use of a higher level image library.

[3] All vulnerability warnings and crash bugs are published on the main page.