You can convert Apple's HEIC files to PDF on a Mac or Windows computer using the free Convertio website.

An image file with the extension ".HEIC" transferred from the iOS device looks something like this and can not be seen on Windows. When "Open HEIC files on Windows" is introduced, you can see the HEIC ...

You can convert HEIC files to the PNG format using a few different methods. Here's how to convert HEIC to PNG on an iPhone, ...