IrfanView is a very fast, compact and innovative FREEWARE image viewer/converter for Windows.

IrfanView is fast and small, with very low system resources requirements.
It is trying to be simple for beginners and powerful for professionals.

Many supported file formats (ANI/CUR, ASF, AU/SND, AVI, BMP/DIB, CLP, EMF/WMF, GIF, ICO/ICL/EXE/DLL, JPG, MPG/M2TS/MP4/MKV, PBM/PGM/PPM, PCX/DCX, PNG, PSD, TGA, TIF, TTF, TXT, WAV etc.).

Some features of IrfanView:
32 and 64 bit versions, Unicode support, multi language support, Thumbnails,
slideshow, fast directory browsing, batch conversion/editing, multipage editing,
file search, email, print, Paint plugin - to paint lines, circles, arrows,
straighten image etc., support for color profiles, change color depth, scanning,
OCR, cut/crop, IPTC edit, screen capturing, lossless JPG operations,
effects (sharpen, blur, Adobe Photoshop filters), add watermark image,
EXE/SCR creating, Unicode support, many hotkeys, many command line options,
60+ plugins …

FREEWARE for non commercial use !