With my current computer I have not installed Java and that gives me a lot of random issue with stuff. My camera software doesn't really do what I want how I want (I think it does do it, but I can't find it). Plus I have a lot of browsing protections and self-imposed limitations on my internet.
But what I use to reduce the size of my images to post here is this free website that doesn't set my virus protection scans whirling into the stratosphere
It's limited but very easy to use. Once I download the images I save them to my Quilting folder in my pictures tab but I can upload them onto the site still in the download file location.
https://www.reduceimages.com/
I had a really nice program maybe 10 years ago that not only did the editing I wanted but also changed formats easily and had a nice system for categorizing the images. Wish I remember what it was, but it probably doesn't even exist anymore.