As someone else mentioned, it's much easier to just use ImageOptim if you're on Mac. There's also a CLI and accompanying tool for NPM that includes this and ImageAlpha and JpegMINI: https://www.npmjs.com/package/imageoptim-cli

But one thing I'd caution is that webp is not a panacea for image optimization. It's only supported in Chrome. If you want to fully leverage next-gen image formats cross browser, you'll also need JPEG 2000 and JPEG XR...and even if you do all of that, you still won't get support for Firefox.

There's also srcset and lossy compression, which are also viable options: https://userinterfacing.com/the-fastest-way-to-increase-your...