I have a feeling this will be old news on this forum, but I just discovered it today.  Google Reverse Image Search  I've tried Tin Eye in the past, but it didn't find anything, but I have just found more than a dozen of my images used without my permission.  Some of them are claiming to be image of things nowhere near where I took the picture!  The one that miffed mt the most was on a baby Jesus website — I so don't do religion!

The tool is amazingly fast.  Open the site in one window, and your online images in another, and just drag the images across.  It never takes more than a second.  How is that even possible?

That's my HDR sunrise behind the vines
The second MX Rider.  This has been pinched several times!
And that's my Giant Weta on the screen behind the news reader.
My tight rope walker, but this is kind of in a good cause.

Those are just three of many.  I was amazed at how many of my pictures have been borrowed, but I guess it is karma as I have used a few Google images in my composites.