You'll want to be squeezing the most out of your images, below are a few tools that will allow you to compress them with zero loss in quality.
Kraken is a robust, ultra-fast image optimizer and compressor with best-in-class algorithms.
Smash PNGs for faster sites. Windows only.
Convert images to Base64
Image compressor for JPEG, PNG, SVG and GIF.
Optimize And Deliver Perfect Images On Any Device
Make optimisation of images part of your automated build process
ImageAlpha greatly reduces file sizes of 24-bit PNG files (including alpha transparency)
Optimise your SVG's!
Reduce the file size of your photos by up to 5x, while keeping their original quality and JPEG format!
Advanced lossy compression for PNG images that preserves full alpha transparency.
ImageOptim optimizes images — so they take up less disk space and load faster