If you have irfanview you just click on the picture and it will default into irfanview, then choose image then resize/resample. Click on radio button if you want a default size or type one in, then save.
Just as easy and probably faster.
Plus you have a lot more enhancment options under the image menu lol.
The program is totally free and there is plugins too for other options.
mspaint works but not as nice.
Also if you are in irfanview and are doing multiple pictures that are in a folder just hit the leftor right arrow and the next picture in the folder will load up unlike those other programs where you have to keep going to file and load or openeing them manually.
I love irfanview and is one of my favourite free programs that I put on all the systems I build for my clients along with avg
Saves me lots of time since I do like 60 pictures at a time and easy to do enhancments too like sharpen or control the brighteness and colour schemes or even simple things like remove red eye.
Lots of options.