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JPEG-XL is recommended as the preferred format for HDR content for PDFs, so it’s more likely to be encountered:

https://www.theregister.com/2025/11/10/another_chance_for_jp...

I'm not convinced HDR PDFs will be a common thing anytime soon, even without this chicken and egg problem of support

What I mean to say is, I believe browsers do support JPEG 2000 in PDF, just not on the web.

the last time that I check it, I find that I need to convert to Jpeg to show the image in browsers.

A *PDF* with embedded JPEG 2000 data should, as far as I know, decode in modern browser PDF viewers. PDF.js and PDFium both are using OpenJPEG. But despite that, browsers don't currently support JPEG 2000 in general.

I'm saying this to explain how JPEG XL support in PDF isn't a silver bullet. Browsers already support image formats in PDF that are not supported outside of PDF.

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