IrfanView is a very fast, small, compact and innovative Freeware (for non-commercial use) graphic viewer for Windows.
IrfanView features include:
Many supported file formats
Multi language support
Slideshow (save slideshow as EXE/SCR or burn it to CD)
Show EXIF/IPTC/Comment text in Slideshow/Fullscreen etc.
Support for Adobe Photoshop Filters
Drag & drop support
Fast directory view (moving through directory)
Batch conversion (with image processing)
Multipage TIF editing
Change color depth
And much more...
popular photo viewer