The iPhone's HEIC file format is better than JPEG, but it's not always compatible, so you need to convert it.

You can convert HEIC files to JPG on a Mac using the Preview app, then you can upload photos to websites that don't support the HEIC format.

Converting an HEIC file to the more widely-accepted JPEG format isn’t a difficult process, and we’ve put together this guide to help you every step of the way.