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JPEG XL is a superior replacement for JPEG. It is better in basically every way to JPEG.

Except compatibility, but the biggest gap is browser support, which is in the process of getting closed. Chrome has shipped JXL support behind a flag. Firefox are in the process of implementing support.

In Chrome you can enable JXL from here: chrome://flags/#enable-jxl-image-format

You can track Firefox progress from here: https://bugzilla.mozilla.org/show_bug.cgi?id=1539075

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