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Google has expanded access to its SynthID Detector, making the tool available globally in English. Users can submit images, video or audio to check for SynthID watermarks associated with AI content from Google and named partners, but the tool does not cover all AI-generated media.
Google says its SynthID Detector is now available to users globally in English, allowing them to check supported image, video and audio files for watermarks associated with AI content made by Google and selected partners. The expansion takes a verification tool previously offered in an early version to media professionals and makes it accessible to the public, though it will identify only content carrying supported SynthID watermarks.
Google describes SynthID as an imperceptible watermarking system for AI-generated images, video and audio. The company says it has applied the technology to more than 180 billion images and videos and to audio equivalent to 240,000 years. Those figures are Google’s own reported totals; the announcement does not provide an independent audit or a breakdown by model, product or partner.
With the expanded detector, users can submit an image, video or audio file and check whether it was made with AI from Google or participating partners. Google names OpenAI, NVIDIA and Kakao as partners, and says support for Apple is coming soon. The announcement does not give a date for Apple support or specify which products and media formats from each partner are covered.
The detector joins verification features Google says are built into Search, the Gemini app and Chrome. Google reports those features handle more than one million requests daily. The company did not give a separate measure of the new detector’s expected usage, describe its error rates, or say how the daily request figure is divided among the existing tools.
A Wider Route to Check Media
Opening the detector beyond media professionals gives more people a way to check whether certain online media carries a supported AI watermark. That may help readers, publishers and other users add context when assessing an image, clip or recording, especially when content is shared without clear information about how it was made.
The reach of the feature depends on what it can recognize. A positive result can indicate that the submitted file contains a watermark the detector supports; it is not, on the information in Google’s announcement, a general judgment about whether media is authentic, misleading or harmful. The company says the tool checks for AI content from Google and partners, not every model or generative service.
That distinction matters because no detected watermark is not proof that content is human-made. The announcement does not say the tool can identify material created by systems that do not use SynthID, or content altered in ways that affect a watermark. Users will still need other evidence and source checks to assess media that the detector cannot identify.
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From Media Experts to Public Access
Google introduced SynthID in 2023 as a way to mark AI-generated media with watermarks designed to be imperceptible to people. The company says the marks can be detected by software, giving users a possible signal about a file’s origin without visibly changing its appearance or sound.
Last year, Google introduced an early version of the SynthID Detector for media professionals. The current announcement widens access to users around the world, with the interface available in English. Google presents the change as part of a broader effort to provide more information about media encountered online, alongside verification functions in some of its products.
The announcement names several outside companies whose AI content the detector is intended to check, but it does not describe the technical or commercial arrangements behind that support. The reported watermarking totals also refer to content marked with SynthID; they should not be read as a count of all AI-generated media online or of files that users can successfully verify through the public tool.
““With the new SynthID Detector, anyone can easily check if an image, video, or audio file was made with AI from Google or our partners.””
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Coverage and Accuracy Remain Unspecified
Google’s announcement does not publish accuracy rates, false-positive rates or false-negative rates for the detector. It also does not explain how results are presented when a file contains only some watermarked material, or whether edits, compression and other changes can affect detection. Those details would help users understand how much weight to place on a result.
The tool’s coverage is also bounded by the stated support for Google and partner content. Google does not claim it can identify every AI-generated file, and its announcement does not list all supported models, formats, file-size limits or regional access restrictions beyond saying that the tool is available globally in English. A detector result should not be treated as definitive evidence about a file’s full history or truthfulness.
Google says Apple support is coming soon but gives no launch date. The announcement also does not say whether the detector will add more languages or partners, or whether Google plans to publish independent testing of its performance.
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Partner Support and Testing Ahead
Users can access the detector in English, while Google says it plans to add Apple support soon. The company has not announced a timetable for that addition, further partner integrations, additional languages or changes to the detector’s availability.
For now, the next useful indicators will be practical details about supported media and published information on how reliably the tool identifies watermarks under different conditions. Google has not committed in this announcement to release those measures. Until more is disclosed, the detector is best understood as a way to check for specific supported watermarks—not as a universal test for AI authorship or media authenticity.
watermark detection for images and videos
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Key Questions
What does the SynthID Detector do?
It lets users submit images, video or audio and check for SynthID watermarks associated with AI content from Google and participating partners.
Who can use the detector?
Google says the tool is available globally in English. The company does not provide further details about regional restrictions or supported file limits in its announcement.
Does it identify every AI-generated image, video or recording?
No. Google describes checks for content from itself and supported partners. The announcement does not say the tool can detect media from all AI systems, so a missing watermark does not establish that a file was made without AI.
Which partners are supported?
Google names OpenAI, NVIDIA and Kakao, and says Apple support is coming soon. It does not provide a launch date for Apple or a detailed list of covered products and formats.
Has Google published the detector’s accuracy rate?
The announcement provides no accuracy or error-rate figures. It also does not explain how performance may vary with file formats, editing or other changes to media.
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