HEIC is an image format using for above iOS 11 and macOS High Sierra. It has been set as default format by Apple while storing photos. Compared with JPEG, HEIC takes up less storage space under the premise of lossless image quality. However, it is not possible to view HEIC image format directly on Windows or older macOS versions. You’ll need best free Deli HEIC Converter to convert HEIC image file into standard JPG or PNG format.