This is an issue tracker for software with no support for JPEG XL. Check this list for supported software.
Browsers Chromium: behind a flag from version 91 to 109, tracking bug Firefox: behind a flag since version 90, tracking bug Safari: supported since version 17 beta release notes, tracking bug Edge: behind a flag since version 91, start with .\msedge.exe --enable-features=JXL Opera: behind a flag since version 77. Basilisk: supported since version v2023.
A small list I gathered of software that is yet to support jxl.
Pillow may be worth adding. From my understanding it’s a popular Python image library, that other projects are waiting for in order for their own JPEG-XL support to be implemented.