Not even Safari on iPhone supports HEIF. Compare HEIF support with AVIF support: https://caniuse.com/?search=heif https://caniuse.com/?search=heif, https://cani

Not even Safari on iPhone supports HEIF. Compare HEIF support with AVIF support: https://caniuse.com/?search=heif https://caniuse.com/?search=heif, https://caniuse.com/?search=avif https://caniuse.com/?search=avif. I don't see this changing either, most browser vendors are going to decide that AVIF is good enough and not pay to license the HEIF patents from the MPEG group.