https://wordpress.org/plugins/tiny-compress-images/
Speed up your website. Optimize your JPEG, PNG, and WebP images automatically with TinyPNG.
image compressiontinypngjpegampwebp
https://pnggauntlet.com/
PNG compression app for Windows. Uses PNGOUT, OptiPNG, and DeflOpt to create the smallest PNGs, without sacrificing any image quality.
png compressionpnggauntletsoftwarenet