CompressImage.io allows you to compress JPG images as well as PNG images with lossy compression techniques right in your browser. None of your images are sent to any servers for compression.
For jpg compression, it uses the compressorJs library which is an open-source jpeg image compression engine written by Fengyuan Chen. For compressing PNG images, CompressImage.io uses the open-source javascript PNG compression script UPNG.js written by Ivan Kutskir.
As the compression is happening in the Browser, there are no limits on how many images you can convert or what size of image you can convert.
Since no images are sent to any servers, your images are totally safe and private as no one else can see your images.
Since no servers are involved in the compression process, zero extra electricity is used, hence no carbon emitted.