What is IrfanView?
IrfanView is a very fast, small, compact and innovative FREEWARE (for non-commercial use) graphic viewer for Windows 9x/ME/NT/2000/XP/2003/Vista.
Tutorial: How to resize and rename multiple images using IrfanView
1. download irfanview
2. install and setup irfanview
3. open irfanview and set batch processing options: size, name, folder
4. start batch
5. show result (size, quality)
Resizing or resampling many files with IrFanview, a freeware image editing tool.
Click Here to get IrfanView