I have a mac laptop and have set up Services using Automator which add options to the right click menu when in Finder. So I have them set to reduce jpg photos on its longest side to 1400px, 1024, 800px and save them in a folder called surprisingly "Exported Photos" which produce jpg files between 100 - 200kb.
I also have Lightroom which can bulk export RAW files to whatever size (kb or pixels) I set.
I didn't think about the option to enlarge the photos which I guess makes ID easier to see zoomed in detail. I'll add another service to create a bigger kb file size and use that from now on.
I was trying to keep the file size small to ease and speed when uploading.