Having activated program from the context menu you can then specify the resizing options you would like to use and the images with be saved as new files on one fell swoop. You can opt to work with a single image at a time, or select several at once, or even choose to work with an entire folder. Light Image Resizer is a similar application that can be access via the context menu so it is always to hand whenever you need it.
Some image editors offer a batch processing option and there are also many standalone tools that do this too. If you are putting together a web site and need to ensure that all of your images have the same dimensions, it can take time to load each picture into an image editor and apply the relevant settings.
Resizing images for any purpose can be a chore.
