IrfanView is a very long-term photo viewer and editor who has seen innumerable changes since it was launched. It enables robust viewing of images on most operational systems which are markedly better than the default picture viewer while also facilitating picture editing (and lot editing): red-eye-cropping correction, or adding borders and other common tasks.
Over the years, IrfanView has improved and improved for its reasons. You should smoothly zoom in or out of your image when viewing images, and the image is used to show you the best viewing image on all levels. You should permanently resize pictures in the same manner. You can use a wide range of filters or fixes and even more with plugins. This is the interface of IrfanView, which is backward. A new user has to navigate with large and challenging menus.
For one example, moving a single file requires you to permanently set the movement directory on the same interface as moving fires in lots. Such oddity is not bad for power users, so the programme does include a small learning curve. But if you see pictures only, none of these things and IrfanView is ideal. It is always perfect if you edit them and have a little time to learn.