IrfanView is a free, lightweight tool that supports viewing and converting a ton of different file formats. Though it's pretty basic, it also packs in some rudimentary editing features, letting you crop, sharpen, blur, or watermark images. Markup is also supported via a Paint plugin that lets you draw on images.
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.
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 !
Picture viewer and converter, multi language support, Thumbnails, slideshow, fast directory browsing, batch conversion/editing, multipage editing, file search, email, print, Paint plugin