posted in Technology
Intent to Ship: JPEG XL – Mozilla Hacks - the Web developer blog
hacks.mozilla.org/2026/08/intent-to-ship-jpeg-xl/🧨1
Replying to @lemmydividebyzero@reddthat.com
What is the big gain over AVIF?
It’s great at lossless? but I never use lossless for web images
Replying to @Eyekaytee@aussie.zone
the big win is that it can re-encode existing jpegs to shrink them by like 30%. also the image is compressed spatially (i think that’s the word) so it can be displayed as it’s downloading rather than coming in line by line.
I think many of us have several GBs of JPEGs that have accumulated over the years. It would be nice to shrink them a bit.
However I wouldn’t do it until the majority of my software supports it. At least with JXL, you can transcode it back to legacy jpeg without losing quality
Replying to @pHr34kY@lemmy.world
The biggest hurdle are messengers, especially including cross-platform support and mobile devices.
Does the lossless transcode work both ways? Thought it was only jpg -> jxl
Replying to @Lojcs@piefed.social
There seems to be a “JPEG reconstruction” feature that gets the original JPEG back.
But if you’re going through the trouble of re-encoding you might as well re-encode to AVIF, no?
Replying to @sunbeam60@feddit.uk
jxl can also extract the original jpeg bit-for-bit, meaning you can save space on disk and still serve exactly the same images as some clients expect. no rewrites.
Replying to @sunbeam60@feddit.uk
Re-encoding from JPEG to AVIF will always drop quality. Lossless re-encoding from JPEG to JPEG XL makes a pixel perfect reproduction, while shrinking file size.