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I was able to find a free service TUXPI here: http://www.tuxpi.com/photo-effects/photo-paper Picasa will work too, though this tool seems to be specifically focused on what you're looking for.
If you open that link in your web browser (for example Google Chrome), and right click on the image, you can choose 'Save image as...'. Choose a filename for the image. You can then freely upload the saved file to a tool like imgur to do the JPG conversion, or perform it yourself easily with Microsoft Paint or GIMP.
If the image is public you can reverse search it. In chrome (IIRC firefox has it too) just right click the image and then "Search google for this image" If you don't have chrome (or FF?) you can save the image locally and go to google images and just drag it over in the box.
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