XnView Shell Extension: edits and views images from the context menu of explorer

XnView Shell Extension is a free shell extension that adds several image-related tools to Windows explorer's right-click context menu, with these tools you can preview, resize, edit, convert and upload images in just a couple of clicks. this program comes to you form the same people who brought you the XnView image viewer, but you do not need to have XnView installed to run it.

 Here are some key features of this program:

• Thumbnail preview:  a thumbnail preview displayed in the main context menu shows image. 
• Customizability: if you do not want any of the functions in the custom menu, you can pick and choose and simply switch it off. You can make the image preview thumbnail bigger or smaller. 
• Image conversion/resizing: you can either convert to another image type or convert and resize. The supported image formats to convert to includes JPG, PNG, PSD, TIFF and more that you may have never heard of.
• Editing IPTC metadata: International Press Telecommunications Council. The range of IPTC metadata information is exceptionally broad.
• Uploading to ImageShack: ImageShack, one of the biggest image hosting services on the net, allows you to upload images without registering and provides you with a URL for use from any site or project. XnView Shell Extension makes uploading to this service just a single right-click.