Although no tool will give you perfect results, the ones below can help you determine if an image was created by AI or not.
Classic Tomy Windup Robot Modeled in Lego. Created by Seejay, image via Creative Commons license 2.0.
Wardle, Claire. "Deepfakes: Is This Video Even Real?" YouTube, uploaded by New York Times, 14 August 2019, https://www.youtube.com/watch?v=1OqFY_2JE1c.
Deepfake programs use artificial intelligence to create videos, images, or audio that appear authentic, but are not real. As deepfake technology improves, it becomes increasingly difficult to identify fake content.
To learn about deepfakes, get started with MIT's "In Event of Moon Disaster".
Learn more with LinkedIn Learning's "Understanding the Impact of Deepfake Videos".
Pariser, Eli. "Beware Online 'Filter Bubbles.'" TED, filmed March 2011, http://www.ted.com/talks/eli_pariser_beware_online_filter_bubbles.