Google has opened its SynthID Detector to the public, giving anyone a way to check images, videos and audio files for invisible AI watermarks.
The tool became available globally in English on October 7 through synthid.com, expanding access beyond the media professionals who previously had access to an early version.
SynthID Detector can check for SynthID watermarks in content created by Google and participating partners, including OpenAI, NVIDIA and Kakao. Google said Apple will also support the technology soon as part of a broader industry effort to make AI-generated content easier to identify and understand.
SynthID is an invisible watermark embedded into AI-generated media. Unlike a visible label or logo, the watermark is designed to remain hidden while providing a way for verification systems to identify supported AI-generated content.
Google introduced SynthID in 2023 and said the technology has now been used to watermark more than 180 billion images and videos, along with audio content equivalent to about 240,000 years. The company has also expanded verification capabilities across Google Search, the Gemini app and Chrome, which together handle more than 1 million verification requests each day.
With the public release, users can upload an image, video or audio file to SynthID Detector and check whether it contains a SynthID watermark associated with Google or one of its participating partners. The tool is designed to provide additional context about digital media as increasingly realistic AI-generated content becomes harder to distinguish from authentic material.
However, a negative result does not prove that a file was created by a human. SynthID Detector only looks for supported SynthID watermarks, meaning AI-generated content from systems that do not use SynthID may not be identified. Likewise, the absence of a watermark should not be treated as proof that an image, video or audio file is authentic.
Google’s expansion comes as technology companies increasingly work on different ways to establish the origin of AI-generated media. By opening SynthID Detector to the public and adding support from companies including OpenAI, NVIDIA and Kakao, Google is positioning the system as part of a broader industry effort to make AI-generated content more transparent.
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Apple is expected to join the system soon, although Google has not provided a specific date for its SynthID support. For now, SynthID Detector is available worldwide in English and focuses on images, video and audio rather than text.
