Images

pngquant – command-line utility and a library for lossy compression of PNG images

pngquant is a command-line utility and a library for lossy compression of PNG images.

The conversion reduces file sizes significantly (often as much as 70%) and preserves full alpha transparency. Generated images are compatible with all web browsers and operating systems.

pngquant is free and open source software.

Features include:

  • High-quality palette generation using a combination of vector quantization algorithms.
  • Advanced quantization algorithm with support for gamma correction and premultiplied alpha
  • Unique adaptive dithering algorithm that adds less noise to images than the standard Floyd-Steinberg.
  • Configurable quality level.
  • Automatically finds required number of colors and can skip images which can’t be converted with the desired quality
  • Easy to integrate with shell scripts, GUIs and server-side software. It’s based on a portable libimagequant library.
  • Fast mode for real-time processing/large numbers of images.
  • Multicore support (via OpenMP) and Intel SSE optimizations.

Website: pngquant.org
Support: GitHub Code Repository
Developer: Jef Poskanzer and Greg Roelofs
License: GNU General Public License v3.0

pngquant is written in C and Rust. Learn C with our recommended free books and free tutorials. Learn Rust with our recommended free books and free tutorials.

Return to Command-Line Image Compression Tools


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