Poladroid is an easy-to-use tool developed with the only goal of converting any picture into the oldie Polaroid format.
You only have to run the application and use drag&drop to add pictures to the conversion list.
It will take some minutes to develop the photos, as the real camera used to do, you'll see how the image appears on the piece of paper.
Finally, you can set the quality of the photo and the output folder.
Enjoy your new pictures giving them a Polaroid look.