PngOptimizer
TinyPNG
ImageOptim
pngquant
OptiPNG
Caesium Image Compressor
PNGGauntlet
pngcrush
GenFavicon
Faviconer
ConvertIcon!
Ordinatore
Online Image Converter
safetoconvert
Favicon.cc
ConvertICO.org
PngOptimizerBased 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: about 2 years ago
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
Faviconer - Faviconer.com, or favicon generator, is online tool for creating favicon.
ImageOptim - Faster web pages and apps.
ConvertIcon! - Converticon is a simple icon utility.
pngquant - command-line utility and library for lossy compression of PNG images
Ordinatore - Those who want to tidy up their Macs will surely love this application.