This last January at FOSDEM there was a panel with representatives from different browser companies. During the panel Kadir Topal, a web platform product manager at Google, indicated that because of the interest they saw in JPEG XL through the Interop Project that they changed their course on supporting it.
That is a very cherishable way to put it. In realty JXL has been on one of the highest request in Interop for at least 2 if not 3 years, and both Microsoft Edge and Safari have spoken about frustration of "certain features" not being implemented despite high number of votes.
The specification for AV2 has only been finalised very recently, so performant encoders have not yet been developed. Meaningful comparison to older codecs like H265 and AV1 will only be possible once that has changed. (It'll be slower, but almost certainly not one-frame-per-second slow.)
I believe MacOS has full support. Windows now has support available as a free installable plugin.
Mozilla said that the current decoder state was unacceptable but if Google Research wrote them a Rust version that met their shippable criteria they'd ship it. That's planned to be done this summer. So I'm optimistic Firefox will ship support (courtesy of Google Research) within the year.
That would just leave Chrome support and Windows to ship by default. I'm hoping Firefox's support would cause pressure on the Chrome team.
This last January at FOSDEM there was a panel with representatives from different browser companies. During the panel Kadir Topal, a web platform product manager at Google, indicated that because of the interest they saw in JPEG XL through the Interop Project that they changed their course on supporting it.
https://github.com/web-platform-tests/interop
The video of the panel can be found at https://fosdem.org/2026/schedule/event/7E7387-browser_in_202... . He starts speaking on the issue at about 13:00
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