How to Convert iOS 11 Photos HEIC to JPG on Windows 10/macOS

How to convert iOS 11 photos HEIC to JPG, on Windows 10/macOS High Sierra 10.12 in particular? How to convert a .heic format to .jpeg format in my iPhone? Note that not all iPhones support HEIC photo taking and viewing - only iPhone models powered by A9 chip and higher, shipped with iOS 11. Since we prefer taking photos in HEIC format to save our iPhone storage space yet not all platforms support this file format, here we will inform you of some easy and quick ways to convert and view HEIC in JPG on all OS platforms.