While there are a number of third-party apps that let you convert HEIC to JPG format, you can convert these files on the iPhone itself, without having to download any apps at all.

Converting HEIC Images To JPG Using The Microsoft Photos App To convert or view HEIC image files on Windows, you first need to ensure that the "HEIF Image Extensions" is installed on your PC.

It's easier than you think to convert an HEIC photo to JPG on your PC.