This was posted on here previously – but will stand up to another show…

IrfanView

IrfanView is a very fast, small, compact and innovative FREEWARE (for non-commercial use) graphic viewer for Windows 9x/ME/NT/2000/XP.

It is trying to be simple for beginners and powerful for professionals.

IrfanView was the first Windows graphic viewer WORLDWIDE with Multiple (animated) GIF support.
One of the first graphic viewers WORLDWIDE with Multipage TIFF support.
The first graphic viewer WORLDWIDE with Multiple ICO support.

Some IrfanView features:
Many supported file formats (click here the list of formats)
Multi language support
Thumbnail/preview option
Slideshow (save slideshow as EXE/SCR or burn it to CD)
Support for Adobe Photoshop Filters
Drag & drop support
Fast directory view (moving through directory)
Batch conversion (with image processing)
Email option
Multimedia player
Print option
Change color depth
Scan (batch scan) support
Cut/crop
IPTC editing
Effects (Sharpen, Blur, Filter Factory)
Capturing
Extract icons from EXE/DLL/ICLs
Lossless JPG rotation
Many hotkeys
Many command line options
Many PlugIns
Only one EXE-File, no DLLs, no Shareware messages like “I Agree”
or “Evaluation expired”
No registry changes without user action/permission!
and many more

IrfanView

Download it, install it, and have a poke around in the edit section to find the change size bits…

Flood.