I need to convert server-side HEIF images (new Apple/iOS format) to a more common image type (e.g. JPG, PNG, ...). Is there any solution Java-based?
I couldn't find any library or other solution.
Nope, checked some months ago, there is no (native) Java based solution yet. You could connect existing external libraries e.g. via JNI, but that would always be platform-dependent.