How can I split a large folder of images into separate sub-folders on my Mac computer?

Yes, the several large folders involved all contain unique name strings anything up to 19 characters long. So far I have been scrolling down a folder with the mouse window after window until I have highlighted a thousand or so images and then clicked control/command/N to create a new sub-folder. This is becoming somewhat wearisome. Is there some way of setting up some method of counting a specific number of files and then automatically creating a sub-folder for them?

I want to apply some other apps to the image files in question. I want to weed out multiple and defective copies of the images and ultimately divide them up into subject categories. Some of the apps I have tried using for this cannot cope with these large folders, which in some cases comprise hundreds of thousands of photographs of paintings, drawings, sculptures and miscellaneous art objects. One of the apps I have used for renaming files might be able to cope with changing all the file names to simpler numerical sequences, I suppose, but I would still have to scroll through the files window by window.

Have just looked at Big Mean Folder Machine recommended by G.C.Thompson and think I will buy it from the Apple Store and give it a go. I already have that app developer's Better Finder Rename 10 and it works OK.

Many thanks for your help.

Many thanks for the helpful suggestion. Will hie me to the Apple Store and purchase the Big Mean Folder Machine forthwith.

Agreed – A nineteen character folder name is definitely unwieldy! I am going to do something about that in due course. Thanks for the suggestion.