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Smaller is what compression is for.

And there are other codecs that compress similarly to JPEG XL that also support other features like animation. So, again, why would I use JPEG XL?

But anyway, this conversation was helpful. I guess there aren't really many reasons to use JPEG XL.

There are no such similar codecs. Jpeg xl is in its own category in compression efficiency when rated by users at densities/qualities used in the internet. Roughly similar efficiency steps between libjpeg-turbo, WebP, AVIF and then jpeg xl.

JXL has the feature set that is better than any other solution.

Killer feature #1 is compressing existing JPEG images. Nothing else can do this

Killer feature #2 is HDR images with over 10 bits of depth and high resolution. It comes out of your camera/phone already like this but we can't post it online! What a joke

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