Looking at CanIUse [1][2], it seems like the HEIF support is in macOS itself, and not the Safari browser. I wouldn't be surprised if the Windows version of Safa

Looking at CanIUse [1][2], it seems like the HEIF support is in macOS itself, and not the Safari browser. I wouldn't be surprised if the Windows version of Safari didn't support it. [1] https://caniuse.com/#feat=heif https://caniuse.com/#feat=heif [2] https://github.com/Fyrd/caniuse/issues/3767 https://github.com/Fyrd/caniuse/issues/3767