This here is quite interesting. Even though I can't remember which photos I needed to converter it's captured my curiosity to learn more about how it would benefit my needs.
Well my granddaughters know a lot more about its workings than I ever would. They are tickled while watching me as I fumble around and give up and ask for them to show me.
I read that Apple uses this format, but my iPhone creates jpeg files. I've never encountered an HEIC type.
My son is an Apple user maybe that's why he recommended this HEIC converter. He forgets his Momma is 'so old school'.
If you download that viewer I posted about, you can view the HEIC file in it, and save it as something else if you want. It's not really a "conversion" process, just a Save As option. The viewer is only available for Windows.
I find the easiest way to convert HEIC to JPG is to simply open the file in Paint, then use "save as" to convert the file. Paint is still included in Windows 10 and 11 as far as I know. Here's some additional info... https://www.maketecheasier.com/convert-heic-jpg-windows10/
As far as the Kindle discussion; a Kindle is an e-reader. The Kindle Fire is a full-function tablet with cameras, etc., so I assume the file question has to do with a Fire tablet.
There is a setting on the iPhone that automatically converts HEIC to JPG if I email a photo from my phone. I was just reading about that because I wondered why pictures I email myself are not HEIC but JPG, so now I know.
I have to admit that I don't know diddly squat about the difference of anything when it comes to technical stuff about computers, phone, etc. until I mess up something. The more I read and try to understand the jargon the more questions I find myself asking and going down the dark hole of 0s and 1s and then forget what I was looking for in the first place. Am I being dramatic?
NOW I understand. Folks were just saying "Fire," but I was finding comments elsewhere about Amazon's Kindle App Store, so I knew that [some] Kindles did more than just display text. Photos are HEIF on my iPhone 12 Mini. Apparently, HEIC is a format developed by the MPEG folks, and Apple calls their version HEIF. When I download them from my iPhone to my WIN10 pc using a cable and no intermediate software (iTunes), they download as JPG. I wonder if they would download to another Apple device as unconverted HEIF (or HEIC) files.
I used to build my own desktop computers and was pretty much on top of this stuff. Not any more. It is overwhelming, and the jargon is--well--"jargon." I will say that when I got my first iPhone after always having Androids, I was so concerned that I would not know how to to the most basic stuff that I watched a bunch of videos and read a bunch articles, driven by fear. Now I can do more on this iPhone that I ever could with the Android, which I never really took the time to learn. Silly, huh?