Mac OS HEIC converter
iMazing HEIC converter is a top rated file converter which allows converting HEIC files to JPG and PNG. It allows conversion by just dragging and dropping your HEIC files onto iMazing HEIC converter app. It is available for download from Apple App store.
iOS HEIC converter
If you have photos on your device which are already saved in HEIC format you can convert them back to JPG using HEIC converter to JPEG or PNG app available on iOS App Store.
Windows HEIC converter
iMazing HEIC converter is also available for Windows OS. Download it from here. Please note that it works for Windows 7 and higher.
We also compiled a list of available free HEIC converters.