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Is JPEG XL also suited to replace PNG like FLIF?

yeah. it's partially based on https://github.com/cloudinary/fuif so if you use that part of JPEG XL you'll get something similar out of it.

Yes indeed, for the lossless mode (based on tech by the same author) we're seeing about 45-82% of GIF size, and 60-80% of (A)PNG depending on content.

Also other famous compression gurus, including Alex Rhatushnyak and Lode Vandevenne contributed to the lossless side of JPEG XL.

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