Google opens SynthID Detector to everyone, checking images, video and audio for AI watermarks
Google's SynthID Detector is now free for anyone and reads watermarks from Google, OpenAI, NVIDIA and Kakao, but checks are capped at about 10 a day and a clean result proves little, since Runway, Kling and Midjourney are not covered.
Google opened SynthID Detector to everyone on Oct 7. Upload an image, video or audio file and it checks for SynthID, an invisible watermark hidden in the pixels or the waveform, and tells you whether the file was made or edited with AI from Google or its partners OpenAI, NVIDIA and Kakao. Google says Apple support is coming soon.
The checks are free but rationed. You sign in with a Google, OpenAI or Apple account and get roughly 10 checks a day, a limit Google engineers told Ars Technica exists to stop people tuning tools that strip the watermark. The answer is a plain yes or no, and it cannot separate a fully generated shot from one that was only edited.
In practice, festivals, clients and broadcasters now have a free lookup for footage from the biggest labs, so a Veo shot or a ChatGPT image you deliver can be identified in seconds. A clean result proves much less, because Runway, Kling, Midjourney and ByteDance are not on the partner list and most open-weight models (the ones anyone can download and run) add no watermark at all.
Source: Google, Ars Technica and Engadget, Oct 7, 2026.




