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* I don't deploy anything not supported in current Firefox ESR. That's June-July 2027.

* The versatility is a bit of a downside when it comes to lossless. Programs play games when it comes to formats mixing both and when may appear to be lossless isn't always thus. It would have been nicer if there was a direct way (via extension+mime) to indicate lossless is expected.

* JPEG transcoding is a very nice feature.

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Quantized PNGs are a thing and those are not easily detected either. For JXL, most files compressed with Modular mode are lossless. You can detected them in the metadata

The problem is not that a file with a lossless extension (e.g. PNG) may have actually had lossy processing.

The problem is that it's not necessarily trivial to tell programs/pipelines/transforms to act only losslessly (there's definitely no common switch; Quality 100 is in fact still lossy in some encoders/formats). In practice some programs use the extension to realize what they should be doing.

This doesn't really solve the problem, but the good news is jxl has excellent generation loss in lossy mode compared to other formats, if you recompress it with high quality, it keeps original quality pretty well.

Unlike older formats:

https://youtube.com/watch?v=qc2DvJpXh-A

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