How do i resize my pictures using irfranview?

Answer 1

On the Irfanview task bar, choose image, resize/resample, and type in the dimensions you want to resize the picture to. If the picture is taller than wider use the height field. If its wider than taller use the width field. Once all the size settings comply with the maximum size limits allowed at G$ (or wherever), click OK. Then choose file, save, and click save. If you don't want to replace the original picture with the resized one, change the file's name.

Answer 2

image > resize/resample
or ctrl+r

if you want to batch resize, go to batch conversion/rename