How do you make images transparent using irfanview?

To make images transparent in IrfanView, first, open your image and ensure it's in a format that supports transparency, like PNG. Then, go to "Image" in the menu, select "Palette" and choose "Change color to transparent." Click on the color in your image that you want to make transparent, and adjust the "Transparency" level as needed. Finally, save the image in a format that supports transparency to retain the effect.