Suppose that, most of you have questions about what is a HEIC image or how to open HEIC on Windows. Actually HEIC is the latest default image format for any iOS 11 & above devices. Right now there is still not a plugin is available yet for users to open or view HEIC image format on the computer except iPad, Macbook, or other iPhone phones.
Therefore, the best and easiest way to view HEIC images is to convert the HEIC image to JPEG so users can view and edit the image. Just use HEIC converter software like Deli HEIC Converter software to convert HEIC to JPEG easily. Besides, if you are hoping to get to know more about HEIC image format, you may refer here on "What is HEIC?" to learn more about it!

I hope this can help out many iOS users or iPhone users that are having difficulties or questions about HEIC default image.