It's a huge piece for sure, but not the only one. For example, Firefox and Windows both don't support it out of the box currently. Firefox requires nightly or an extension, and on Windows you need to download support from the Microsoft store.

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JyrkiAlakuijala 3 hours ago | parent | next [-]

Would PDF 2.0 (which also depends JPEG XL and Brotli) put pressure on Firefox and Windows to add more easy to use support?

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jchw 2 hours ago | parent [-]

I don't think so: JPEG 2000, as far as I know, isn't generally supported for web use in web browsers, but it is supported in PDF.

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fmajid 2 hours ago | parent [-]

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...

	▲	jchw 2 hours ago \| parent [-]
		What I mean to say is, I believe browsers do support JPEG 2000 in PDF, just not on the web.

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zinekeller 38 minutes ago | parent | prev [-]

> on Windows you need to download support from the Microsoft store.

To be really fair, on Windows:

- H.264 is the only guaranteed (modern-ish) video codec (HEVC, VP9, AV1 is not built-in unless the device manufacturer bothered to do it)

- JPEG, GIF, and PNG are the only guaranteed (widely-used) image codecs (HEIF, AVIF, and JXL is also not built-in)

- MP3 and AAC are the only guaranteed (modern-ish) audio codecs (Opus is another module)

... and all of them are widely used when Windows 7 was released (before the modern codecs) so probably modules are now the modern Windows Method™ for codecs.

Note on pre-8 HEVC support: the codec (when not on VLC or other software bundling their own codecs) is often on that CyberLink Bluray player, not a built-in one.