Thorn Cas is a simple and light program (just 40 Kb.) That allows you to create a JPG graphic file in which it includes small thumbnails of all the photographs that contain the folder that you indicate, that is, it makes a kind of collage with all them, being grouped to identify them quickly.
Thorn Cas allows you to specify the size in pixels of the resulting JPG, as well as the background color, color and size of the text (for the name of each of the mini photographs) and also the quality of the JPG.
In this way, with Thorn Cas you will not have to see all the photographs contained in that folder one by one, because at a glance you have them all grouped into a single JPG.
You can free download Thorn Cas 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.