ImgBoost is described as 'Free online image compression tool for JPG/PNG files. Images can be compressed to as much as 60% of the original size. ImgBoost also supports WebP conversion. Convert JPEG and PNG images to WebP format to lower file sizes by additional 25%' and is a Image Optimizer in the photos & graphics category. There are five alternatives to ImgBoost, not only websites but also apps for a variety of platforms, including Mac, Google Chrome, SaaS and Adobe Photoshop apps. The best ImgBoost alternative is ImageOptim. It's not free, so if you're looking for a free alternative, you could try ImageOptim or RasterFox. Other great sites and apps similar to ImgBoost are TinyJPG and Kraken Web Optimizer.