This is a problem for all kinds of reasons, and, as such, the AI companies are attempting to address it. Images produced by Gemini and ChatGPT come with an invisible watermark called SynthID. That way, AI-generated images don't need visible branding in order to identify their origins. Of course, you need access to a detector to know whether this watermark is present. As it happens, Google just launched a standalone SynthID checker tool on the web, free for anyone to use. I gave "SynthID Detector" a shot, and while it largely works as expected, it isn't perfect.
How Google's SynthID Detector works
SynthID doesn't promise to always detect AI. Credit: LifehackerGoogle doesn't say exactly how SynthID works, presumably to make it more difficult to get around, but does confirm the watermark is "robust against common transformations." It also says the watermark is "woven into the content itself", which means pixels for images and video, and frequency components for audio. The company also admits its detection tool isn't infallible. What it calls "heavy modifications" can degrade the watermark sign, as can multiple "transformations" applied to the same image. The recommendation is to use files that are as high quality as possible, so it seems to me that more data makes detection more reliable (similar to AI text detectors).
Putting SynthID Detector to the test
I started with some easy tests. The detector correctly spotted that images created in Gemini and ChatGPT, and downloaded directly to disk, were indeed fake. It only took a few seconds to confirm, and it also identified the AI tool that had been used to make them.
It also correctly marked one of my own photos as AI-free, although it did hedge its answer a little, saying that it was "unlikely" that the media was made with AI. All the detector could say with confidence was that there was no SynthID watermark, showing that it's this watermark in particular that it's checking for. It's not looking for any other signs of AI.
In the majority of tests, the detector worked flawlessly. Credit: LifehackerEventually, I did beat the detector. Once, when I heavily pixelated an AI image—at which point I rather suspect my disinformation campaign would be pretty ineffective anyway—and once when I created a composite image, which was 75% real, 25% AI-generated. With less AI to work with, the detector can falter.
Only the man in the foreground in this photo is AI—but the detector flagged it as fake. Credit: LifehackerThere is a quota limit here, which seems to be around 10 files per day—but 10 each for images, videos, and audio files. Once you've hit your limit, you need to wait 24 hours to try again. As far as I could tell, the SynthID Detector is exactly what Google says it is: a useful check to have, but far from a guarantee one way or the other.
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