Just a quick note too: if you use Paint for this, better to use the 'Open With...' command than to copy and paste into Paint. Reason being, if you copy and paste into a new Paint document, when you go to save it, Paint wants to save it as a .bmp file and that makes the file quite large in size, and if you change the file extension to .jpg, the saved image is kinda grainy.

Opening a .jpg image with Paint means that the file type is already set to .jpg and when you go to save it, the saved image is a low file size but there's no deterioration in quality.