Windows version: https://www.microsoft.com/en-au/p/assetizr/9pj6j7v92n8n
macOS version: https://itunes.apple.com/de/app/assetizr/id1449126727?l=en&m…
Seems like a pretty simple/easy-to-use batch image resizing and compression tool. Free for a limited time.
If you need a simple Windows 10 resizer that's light on resources (not 276.6Mb), Windows Image Resizer just works - right click on the image(s) and away you go.