For example, if a JPG file is about 2MBa, the HEIC equivalent will be around 1.2MB. The reason Apple adopted this format is because these images are about half the size of the equivalent JPGs. That's because there's no native support on Windows and macOS computers that don't have the latest macOS High Sierra update can't view or display HEIC images without the help of additional software.
Apple's HEIC and HEIF image formats are a godsend for memory-constrained iOS 11 devices, but they're as much a curse to Mac users as Windows users.
