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.
Jihosoft Free HEIC Converter - Wondering about how to convert HEIC to JPG and open HEIC files in Windows? This excellent HEIC converter will give you the answer.
pngquant - command-line utility and library for lossy compression of PNG images
Aiseesoft HEIC Converter - Aiseesoft HEIC Converter is a useful tool that converts photos from HEIC to JPG/JPEG or PNG. You can open iPhone HEIF images on non-Apple devices conveniently.
TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
AConvert - Convert document, image, video, audio files online