Batch Converting 100 HEIC Files: Which Tool Actually Handles It?

https://www.fastbookmarks.win/why-some-converters-add-a-grey-film-to-your-images-and-how-to-stop-it

When a Wedding Photographer Has 100 HEIC Files to Deliver: Alex's Friday Night Alex shot a small backyard wedding on an iPhone and delivered 100 HEIC files to a client who specifically asked for JPEGs