Have you found your screen captures too large to be sent or shared using ShareX? You can create smaller screenshots easily by adjusting the image quality setting in ShareX. Here’s how you can achieve that.
Run ShareX on your PC, select Task settings… from the left panel of the main interface. The Task settings opens in a new window. Click Image from the left pane, you can then find the JPEG quality option on the right. By default, the image quality is set to 90, you can reduce it to a smaller value, say 50, so as to get much smaller image size.