What is imgult?

imgult is a fast and free solution to lossless image optimization. It is made for Linux and Mac systems.

Is there a GUI?

For Mac users, you can run this script that will install imgult and all its dependencies, along with the automator version of imgult:

curl | sh

That means imgult will show up in your right-click contextual menu, and you can even set it to a keyboard shortcut! For Linux there is no GUI version yet (but I prefer the command line version, even on my Mac).

For more details on install and usage, check the GitHub repo.