Thumbnail Grabber is a free utility that is used to create thumbnail screenshots, the so-called 'thumbnails', in JPG format.
The program allows you to choose several options. First, you can indicate the size of the web page you are going to capture, in width and length. Subsequently, you can also choose the size of the capture itself, in terms of total percentage with respect to the web.
Another interesting option is to process several URLs or domains massively from a text file. Thumbnail Grabber is a very small tool (just over half a mega) and completely free.
You can free download Thumbnail Grabber 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.