How do you cut out a picture on Irfanview and make it not a square more of a circular or to fit the object?

In IrfanView, you can cut out a picture in a circular shape by first selecting the area you want to keep using the "Selection" tool. Choose the "Custom selection" option and hold down the Shift key while dragging to create a circular selection. After making your selection, go to Edit > Copy, then create a new image (File > New) and paste the selection there (Edit > Paste). Finally, save the new image in your desired format.