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Google made its SynthID Detector publicly available worldwide in English on October 7, 2026. Upload an image, video or audio file to the portal to check whether it contains a SynthID watermark. You can also ask Gemini about supported media, while Google says built-in checks are available in Search and Chrome. A result can help identify a watermark from a participating system; it cannot determine whether all AI-made media is authentic or human-made.
What changed with Google’s SynthID Detector
Google’s October 7, 2026 announcement expanded the Detector from an earlier group of professional testers to public access globally in English. Google says it checks image, video and audio files for SynthID marks associated with Google and partners including OpenAI, NVIDIA and Kakao. Apple was described as coming “soon” in that announcement, so it should not be treated as an already completed integration. Google’s announcement
Google also says built-in verification features across Search, Gemini and Chrome regularly handle over 1 million requests a day. That is a company-reported usage figure, not an independently audited count. The same announcement reports that SynthID had been used on over 180 billion images and videos and 240,000 years of audio content cumulatively by October 7, 2026; those are Google-reported totals, not independent measurements. Google’s announcement
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How to check a file with SynthID Detector
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Open Google DeepMind’s SynthID page and follow its link to the SynthID Detector portal.
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Submit the image, video or audio file you want to check.
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Review whether the portal reports a SynthID watermark. Where available, results may identify portions of the media more likely to contain the mark.
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Use the finding as one provenance clue. If no watermark is found, do not infer that the file is authentic or was made without AI.
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Google’s current announcement does not state accepted file extensions, maximum upload sizes or durations, sign-in requirements, or account eligibility. Check the live portal for its current upload rules rather than assuming a particular file will be accepted. Google’s announcement
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How to ask Gemini about media
Check an image
In Gemini, upload the image and ask a direct question such as “Was this created with Google AI?” Google says Gemini checks for SynthID and uses its own reasoning to provide context. The phrasing asks about Google AI specifically; it is not a universal check for every AI system. Google’s Gemini announcement
Check video or audio
Google DeepMind says users can upload image, video or audio clips in Gemini chat and ask whether they were created or altered by Google AI. Google also identifies Search and Chrome as services with built-in checks, but the cited official descriptions do not specify the exact steps or availability for every surface. Google DeepMind’s SynthID overview
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What a SynthID result does—and does not—tell you
A positive result
A detected mark is evidence that the checked media contains a SynthID watermark. It can support a provenance assessment for content made by a participating system that adds a compatible mark. It is not a complete history of who created or edited the file, and it does not by itself establish whether the content is truthful or authentic.
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No watermark detected
A negative result is not proof that media is human-made. The file may come from a generator that does not use SynthID, or a watermark or other provenance signal may be absent or no longer detectable. OpenAI’s October 2026 provenance explanation says that if its checks do not detect metadata or a watermark, it will not make a definitive conclusion about whether content came from its tools because provenance signals can be stripped. OpenAI’s provenance explanation
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How SynthID differs from other provenance checks
SynthID is a watermark embedded in generated content. Content Credentials and C2PA, by contrast, refer to provenance metadata. A classifier’s estimate is a different kind of signal again. These approaches answer different questions and can have different failure modes; checking one does not replace checking other available context. OpenAI’s provenance explanation
SynthID technology supports more than the public portal states
Google DeepMind describes SynthID as technology for embedding imperceptible watermarks in AI-generated images, audio, text and video. However, Google’s October 2026 public Detector announcement names image, video and audio uploads—not text uploads. Do not assume the public media portal can check text just because the broader SynthID technology includes text. Google DeepMind’s SynthID overview Google’s Detector announcement
Google separately documents SynthID Text for detecting watermarks in model-generated text. Its developer-facing detector can return “watermarked,” “not watermarked” or “uncertain,” and detection is probabilistic. Google notes that thorough rewriting or translation can reduce confidence. This text implementation is distinct from the public portal’s stated image, video and audio inputs. Google AI for Developers’ SynthID Text documentation
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The original Detector portal, announced on May 20, 2025, was aimed at journalists, media professionals and researchers through an early tester rollout. Google described results that could highlight likely marked areas in images and segments in audio. That launch context is historical: the October 2026 announcement is the source for the current public-access status. Google’s May 2025 announcement Google’s October 2026 announcement
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