PngOptimizer
ImageOptim
pngquant
TinyPNG
OptiPNG
Caesium Image Compressor
PNGGauntlet
pngcrush
Phatch
ImBatch
DVDVideoSoft Image Convert and Resize
Batch Image Resizer
Ralpha Image Resizer
Fotosizer
PhotoBulk
XnConvert
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Based on our record, PngOptimizer seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Personally, I like the psydk PNGOptimizer https://psydk.org/pngoptimizer for PNG files and FileOptimizer for JPEG files. The latter will work on all kinds of files but is exceptionally slow on PNG files. You can mess with the settings so it doesn't take so long but I don't bother. Source: almost 2 years ago
ImageOptim - Faster web pages and apps.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
pngquant - command-line utility and library for lossy compression of PNG images
DVDVideoSoft Image Convert and Resize - Free Image Convert and Resize is a compact yet powerful program for batch mode image processing.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats