OptiPNG is an advanced command-line utility for optimizing PNG files. It can reduce file sizes of PNG images by applying lossless image compression techniques. It supports all PNG file types, including indexed, grayscale, RGB, and alpha channel formats. It can also compare two PNG files and determine which one is the more optimized version. OptiPNG is a great tool for web developers who want to make sure their webpages load quickly and efficiently by optimizing their PNG images. It also offers additional features such as color reduction, cropping, and gamma correction. Additionally, OptiPNG supports a range of additional optimization techniques, including zopfli, deflate, and pngcrush.
The last discontinued version, 1.0, was released in April 2005. It can still be downloaded from Wayback Machine.
Excellent. So quick and easy to use, just drag and drop. Reduces 60% of my image. That's awesome, saves us a lot of trouble.