Shameless plug for my tool for automatically taking in a static site and spitting out one that uses responsive optimized images: https://github.com/trishume/enf

Shameless plug for my tool for automatically taking in a static site and spitting out one that uses responsive optimized images: https://github.com/trishume/enfasten https://github.com/trishume/enfasten Unlike all non-custom Gulp/Webpack/JS based tools I know, it does incremental builds so that it only resizes/optimizes images that you change or add, so it won't substantially slow down your site build times. It also rewrites the output of your existing static site generator so you don't have to do much to integrate it.