I use Tapatalk, as do many, they look the right size on phone/tablet and you can't tell if they are big. It's only on a computer you can tell different and preview like you mentioned.I love all the info and pics, guys, but try and reduce the size a bit, large pics are great, but the lateral scrolling is a pain. This is very easy to do with imgur. When you post it, do a preview, and if it is larger than the pane, choose a smaller size.
Also, if you upload pics normally and don't use a host like imgur, Flickr, etc you don't get an option to resize. You'd have to open with something like paint shop and fix it which is ridiculous.
Sent from the drivers seat of my 05 4runner.