Luma is designed to enable you open and convert to jpeg multiple images with *.HEIC file extension at a time. These are images in High Efficient Image Format (HEIF). Images in this format take twice less space on your device without any loss of image quality. Using this format will help you to save up to 50% of storage space for images. Luma works completely offline and you don't need to internet connection to make the app working. You can either open single image or select any number of images