I use Automator (mac os app) to do this, but it seems like such a dumb thing to do so regularly. If i transfer a photo on my iphone via google drive or some other cloud service, it inevitably needs to be changed to jpg.
I've been programming for 2 decades now, so I'm a bit over the hill. And admittedly been in management roles so the only coding I do is in my spare time now. I mostly program Swift and Python. I'd like to get started by making some updates to a long standing python/django app I have, and then I'd like to look into making something from scratch for iphone. I'd like to use the best tools, and I'm fine with paying. Where to get started?