Tools to Detect AI Images: What Works and What Fails
SynthID and Decopy are the two tools users recommend for detecting AI images, and no tool delivers reliable results across all AI models, so most people pair a detector with manual visual checks. Every known method has blind spots. Watermark checks only catch images from models that add watermarks. That gap is why users spend as much time on visual cues as on tools. SynthID is invisible watermark technology used by Google and OpenAI. You can upload an image to OpenAI's verification page or ask Gemini to check for a SynthID watermark. Users stress one point: the presence of a watermark is proof an image is AI, while a missing watermark proves nothing. A fully AI generated image can still carry no watermark at all. Decopy earns praise for a different reason. It explains why an image might be AI generated instead of returning a bare yes or no. Those reasons let you judge the verdict yourself, which matters when other detectors give results you cannot verify. The caveats are real. Users say detection tools can be circumvented, and watermarks can be removed or left out by the model that made the image. One user noted you could even run a real photo through an image generator and end up with a SynthID on it, which would mark a real photo as AI. Detectors also produce false positives and false negatives, and one user called detection beyond planted metadata 'generally bs.' On top of that, AI keeps improving, so what works today likely will not work in the future. Manual checks fill the gap. Users advise looking for small details that make no sense, like the number of fingers or the patterns in a background. AI often struggles with backgrounds and minor elements, so you may see melted or zombie faces and text that reads as nonsense. Illogical shadows are another tell. The last cue is polish: one user put it well when they said what reads as too polished is the absence of camera defects.

