Lossy PNG compressor — pngquant command based on libimagequant library

Insane(ly slow but wicked good) PNG image optimization

Image compression in web browser

Image conversion and optimization desktop app.

nin is ninjatool

Lossy PNG compressor for RGBA PNGs. Has two modes: lossy averaging filter (blurizer) that denoises the image and optimal posterization using Median Cut quantization to reduce number of unique colors in the image with minimal visual distortion

Simple image optimizer for JPEG, PNG and GIF images on Linux, MacOS and FreeBSD.

Batch image resizer, optimiser and profiler using ImageMagick convert, OptiPNG, JpegOptim and optional ZopfliPNG, Guetzli and MozJPEG.

Lossy compression of PNG images

`pngwolf` uses a genetic algorithm to find PNG scanline filter combinations that compress well

A really fast encoder for PNG images in Java.

A Python Wrapper of Pngquant

(Windows) Easy image, video optimization / converting tool + Web Favicon generator

Optimize png files – when every byte counts!

Optimize PNG image files by removing unnecessary PNG chunks thus losslessly reducing file size.

Color quantization/palette generation for png images

WIP deflate toolkit for Java

🗜 🖼 Microsoft Windows Multi-thread GUI for compress easy and fast PNG files using pngcruch or pngquant.

Generate ZorroSVG files from PNGs.

🖼 Pixxia uses lossy compression methods to reduce the document size of your JPG/PNG files.