It could be the format you are saving it in. The best I can do is give you the
link that I downloaded and use (recommended by another member years ago and its free) and some directions. After you download, if you choose too--Go to open(step 1)---get your pic. Skip down to "options" and set width to 400 (height will set itself, don’t change anything else). Click resize (step 2), you'll see it change in the window. Then save new pic (step 3) in JPEG, (use the pull down arrow). That should help with posting pics. HTH.