In more detail
It is slower to encode than JPEG or WebP and some older software cannot open it, so a JPEG converter is often needed for sharing.
AVIF is an image format based on the AV1 video codec that gives very small files at a given quality and supports transparency, animation and HDR.
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It is slower to encode than JPEG or WebP and some older software cannot open it, so a JPEG converter is often needed for sharing.