HEIC to PDF: The HEIC format can only be seen on iOS devices and is much family to these iPhone devices, where any image has been taken. Unlike other Android or Windows devices, the image file will not be in JPG format or any usual format. HEIC to PDF HEIC to PDF: The HEIC format can only be seen on iOS devices and is much family to these iPhone devices, where any image has been taken. Unlike other Android or Windows devices, the image file will not be in JPG format or any usual format.