sips -s format jpeg your.heic --out your.jpg
your.heic
into a new your.jpg
.Well, one can learn every day something new. 😁 macOS comes with a built-in »Convert Image«-Quick Action to easily convert HEIC images to JPEG.
Yeah I had a look and it's a substantial saving. 7.6MB to 1.9MB.Huh, so there is! It even supports batch converting if you select a bunch of files at once and click "Convert Image" which is awesome!
For OP, I'd check this with the JPGs from your camera to see if it's worth the effort. I just tried it on a few JPGs I have and some of them it only saved ~20% (from 6MB to 5MB) whereas larger ones it saved 75% of the space (from 60MB to 15MB)! So it probably depends a lot on the settings your camera uses for saving JPGs.
Raider is now Twix. 🤪 similar for HEIC and HEIF:EDIT: I don't have HEIC as an output option it's HEIF!!! I'm always getting in a muddle with them.