Google’s SynthID Detector became publicly available worldwide in English on October 7, 2026. Use it to check an image, video or audio file for a SynthID watermark—a provenance signal associated with participating AI systems, not a universal test of whether media is AI-generated or authentic.
What changed in Google’s SynthID upgrade?
Google expanded the Detector from an earlier professional tester group to public access globally in English. Its October 7, 2026 announcement says the portal checks images, video and audio for SynthID marks associated with Google and named partners OpenAI, NVIDIA and Kakao. Google described Apple as a future addition (“soon”), not as an integration already completed at announcement time. The partner list and availability may change.
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The original portal, announced on May 20, 2025, was intended for journalists, media professionals and researchers in an early tester rollout. Google said results could highlight likely marked regions in images and segments in audio. The current announcement supersedes that limited-access status. (Google’s October 7, 2026 announcement; May 20, 2025 launch post)
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Google also says built-in verification features across Search, Gemini and Chrome regularly handle over 1 million requests daily. That is a Google-reported usage figure, not an independently audited count. The company says more than 180 billion images and videos and 240,000 years of audio content had been watermarked with SynthID as of its October 2026 announcement; those are cumulative company-reported totals, not a measure of the Detector’s accuracy or coverage.
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How to use the SynthID Detector
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Open Google’s 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, inspect any highlighted image areas or audio/video segments that are more likely to contain one.
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Use the result as one clue about provenance. If no watermark is found, do not treat that as proof that the media is human-made or genuine.
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The cited Google announcements do not specify accepted file extensions, maximum upload size or duration, sign-in requirements, or account eligibility. Check the live portal for its current submission requirements.
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Check supported media through Gemini, Search or Chrome
Google also describes verification through features built into Gemini, Search and Chrome. In Gemini, upload an image and ask a direct question such as “Was this created with Google AI?” Google DeepMind says users can also upload image, video or audio clips in chat and ask whether they were created or altered by Google AI. The available checks and supported inputs may vary by feature; the portal’s stated public inputs are image, video and audio.
Gemini’s answer is not the same as a universal authenticity verdict: Google says it checks for SynthID and uses Gemini’s reasoning to provide context. See Google DeepMind’s SynthID overview and Google’s November 2025 Gemini announcement for the described features and example flow.
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What a SynthID result can—and cannot—tell you
A positive result points to a specific watermark
SynthID embeds an imperceptible digital watermark in content generated by systems that use the technology. A detected mark is evidence that the checked content carries that signal; it does not, by itself, establish who created or edited the file, when it was made, or its complete history.
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A negative result is not proof of authenticity
The Detector looks for SynthID, not every possible AI watermark or generation pattern. Media made with tools that do not add compatible SynthID marks will not necessarily be identified. A watermark or other provenance data can also be removed or lost when content is edited or shared. OpenAI, which says its tools use Google SynthID for images and supported audio alongside C2PA metadata, cautions that a missing signal does not support a definitive conclusion about whether content came from its tools. (OpenAI’s October 2026 provenance explanation)
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For consequential decisions, combine a watermark check with other context: where the file came from, whether a trusted original exists, and whether other provenance information is available. A watermark is one signal, not a substitute for verifying the source.
The public media portal is not a text checker
SynthID technology can also watermark text, but Google’s public Detector announcement lists only image, video and audio uploads. Google separately documents SynthID Text for developers; that text detector can return “watermarked,” “not watermarked” or “uncertain,” and its confidence can fall when text is thoroughly rewritten or translated. Google explicitly describes watermark detection as probabilistic. Those text-specific results and caveats apply to the developer-facing text implementation, not automatically to the public media portal. (Google AI for Developers: SynthID Text)
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