WordPress Opti MozJpeg Guetzli WebP - is the FREE plugin for high quality image optimization in WordPress website. It was created to meet latest requirements of Google Pagespeed Insights. Google will "like" all your images after using this plugin, and you will expend $0 for that.

reSmush.it is the FREE image compressor and optimizer plugin - use it to optimize your images and improve the SEO and performance of your website.