TinyPNG - Make your website faster and save bandwidth. TinyPNG optimizes your PNG images by 50-80% while preserving full transparency!
TinyJPG - Compress JPEG images with perfect quality and file size
Imagify.co - Resize, Crop and Manipulate your images on the fly!
Caesium Image Compressor - Compress your pictures up to 90% without visible quality loss.
Image Compressor - Windows/Steam desktop tool to compress images and save size with almost the same quality.
HitPaw Compressor - HitPaw Compressor is the most effective and powerful software that can easily compress videos or images with several clicks in seconds.