I heard about this recently and decided to look into it. Seems neat. When I convert my existing .jpeg images to .jxl, they look identical, but take up only ~60% the space. Windows file explorer and paint dont support it however, but ImageGlass does. Considering converting all my images to .jxl to save on storage space (esp. cloud storage). Thoughts?
JPEG XL is awesome. I got 1/8 of the size converting (very small, like 800kB) PNGs to lossless JXL.
GIMP can open them I think, but can’t save them. ImageMagick supports it obviously and so does KDE’s image library so I get previews there and whatnot.
It really depends on what you want to use them with imo, if you view them in a specific program and that supports it, go for it.