How to convert a HEIF/HEIC image to JPEG in El Capitan? So, here’s the thing. I have a new iPhone and an old Mac. iOS 11 (still in beta as of today) and El Capitan (no more updates for this Mac). I use iCloud photo library in both devices. When I take a photo in the new format with my iPhone 7, is there any way to use it right away in my mac, without having to convert it in my iPhone first? I mean, can I get those photos synced through iCloud and converted locally on my Mac?

I have tried to find a third party software that could do that kind of conversion, but was not able to find any that would work on El Capitan. Any idea?
You can use the command line tool imagemagick to convert HEIC images to JPG.

# install imagemagick
brew install imagemagick

# convert a single image
magick convert foo.HEIC foo.jpg

# bulk convert multiple images
magick mogrify -monitor -format jpg *.HEIC