Faststone Image Viewer is compact piece of software developed for your image viewing needs.

It’s very small (installation file is about 3mb) and is fast when working with images. It shows them either in thumbnails or listed icons and it has quality filebrowser. When you open the image you can zoom it with the left mouse click which is a great option because of it’s speed and quality (zoomed image isn’t very pixely) To summarize – a great program which will save your time and nerves when working with.