Google has expanded access to its SynthID Detector, making the tool available worldwide in English to help identify images, videos, and audio created with artificial intelligence (AI).
Google DeepMind announced the expansion, moving the verification tool beyond its earlier testing phase, which targeted journalists, media professionals, and researchers.
The tool helps people determine whether digital media contains SynthID, an invisible watermark embedded in AI-generated content. Google says the detector can identify content created using its own AI systems and those of participating partners, including OpenAI, NVIDIA and Kakao, with Apple expected to join in the future.
The announcement comes as increasingly realistic AI-generated images, videos and audio raise questions about how people can verify the origins of content shared online.
How Google’s SynthID Detector works
SynthID is a digital watermarking technology developed by Google DeepMind. It embeds signals into AI-generated content that remain imperceptible to people but detectable by specialised technology.
Unlike a visible label or conventional watermark, SynthID embeds directly into digital media without noticeably affecting quality.
Users can submit supported images, videos or audio files to the SynthID Detector for analysis. If the system detects a SynthID watermark, it can indicate that the content, or parts of it, were generated using AI systems that use the technology.
For videos and audio, the tool can help identify specific sections containing watermarked material. This may be useful when only part of a recording has been generated or modified using AI.
However, the detector is not a universal AI-content checker. It looks for SynthID watermarks and cannot reliably establish whether every piece of unmarked content was created by a human.
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Google reports billions of watermarked images and videos
Google said it had embedded SynthID watermarks in more than 180 billion images and videos, as well as the equivalent of 240,000 years of audio content.
The figures show the scale at which Google says it has deployed the technology across its AI products and services.
The company has incorporated SynthID into several generative AI systems, including tools for creating images, videos, and audio.
Google has also expanded content-verification features across products such as Search, the Gemini app and Chrome. The company said these built-in features regularly handle more than one million requests per day.
The wider rollout of the standalone detector is intended to give users another way to check the origins of digital media, particularly when content is encountered outside the platforms where it was created.
AI industry partnerships broaden the technology’s reach
Google’s announcement also highlights efforts to extend SynthID beyond content generated exclusively by its own AI systems.
The detector supports content from participating partners, including OpenAI, NVIDIA and Kakao. Google said Apple was expected to join the initiative in the future.
Wider adoption could increase the number of AI-generated images, videos and audio files that can be checked using the same watermarking technology.
However, this does not mean that SynthID can identify content from every AI model or platform. Its effectiveness depends on whether the content contains a watermark the detector can recognise.
The expansion reflects a broader industry effort to improve transparency around how digital content is created and edited.
What the rollout means for journalists and the public
The tool could help journalists, researchers, educators, publishers, and members of the public seeking more information about the origins of digital media.
For news organisations, checking for watermarks may be part of a wider verification process when assessing images, recordings, or videos circulating online.
For ordinary users, the detector offers another way to investigate whether supported media was generated using AI, rather than relying solely on visual inspection.
Nevertheless, the presence or absence of a SynthID watermark should not be treated as conclusive proof of a file’s authenticity.
A detected watermark can provide evidence of AI involvement, but it does not necessarily establish who created the content, whether it is misleading or whether the information it contains is true.
Likewise, a failure to detect SynthID does not prove that a file was created without AI. Tools that don’t use the watermark may generate content that can’t be identified, and technical limitations can affect detection.
Journalists and other users should therefore continue to consider the original source, surrounding context and other available evidence when verifying material.
A step towards greater transparency in AI-generated media
Google’s decision to expand SynthID Detector globally marks a further step in its efforts to help users understand how online content is produced.
By making the tool available beyond its earlier group of professional testers, the company is extending access to a technology designed to identify watermarks in supported AI-generated media.
Its usefulness will depend partly on how widely AI systems adopt SynthID and how effectively users combine watermark checks with other verification methods.
As AI-generated media becomes more common, tools such as SynthID Detector could help provide additional context about digital content. However, no single watermarking system can independently determine whether all online material is authentic or trustworthy.
Bio: An (HND, BA, MBA, MSc) is a tech-savvy digital marketing professional, writing on artificial intelligence, digital tools, and emerging technologies. He holds an HND in Marketing, is a Chartered Marketer, earned an MBA in Marketing Management from LAUTECH, a BA in Marketing Management and Web Technologies from York St John University, and an MSc in Social Business and Marketing Management from the University of Salford, Manchester.
He has professional experience across sales, hospitality, healthcare, digital marketing, and business development, and has worked with Sheraton Hotels, A24 Group, and Kendal Nutricare. A skilled editor and web designer, He focuses on simplifying complex technologies and highlighting AI-driven opportunities for businesses and professionals.
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