Image Resizer Powertoy Clone lets you resize image batches with one step
Image Resizer Powertoy Clone is a neat, free Windows utility, that doesn't forget to give credit where credit is due. I've never used the original Powertoy, but I can tell you its clone lets you very easily batch-resize image files.
You get a single context menu entry (yes, another one) that says "Resize Pictures". When you select several image files and click this entry, a simple-looking dialog pops up (which is what you see above). In "Basic" mode, you get to choose one of four preset resolutions. "Advanced" mode lets you specify a custom resolution, choose to make pictures smaller but not larger (i.e, don't blow up smaller images – a wise decision) or resize the original picture rather than creating a copy.
The copies are sensibly named – for example, I tried the Mobile option, and all copies just had (Mobile) appended to the original filename. Personally, I don't see myself using this tool because it's just not customizable enough (and I already use IrfanView's batch mode for these sort of operations). But if you're just looking for a quick, simple solution – this is a well-made piece of software, and I think it can definitely come in handy.