Google opened up Google SynthID Detector to the public today. Until now, it was mostly available to journalists and media professionals; now anyone can use it in English at synthid.com. Once you sign in, you can upload an image, video, or audio file, and the tool checks for Google’s SynthID watermark to flag media made with supported tools. Google says SynthID Detector can identify content from Google Gemini, Google Imagen, Google Lyria, and Google Veo, along with partner media from OpenAI, Nvidia, and Kakao. Apple support is expected later this year.
There’s a limitation, though. Google SynthID Detector only detects Google’s SynthID watermark, so a negative result doesn’t prove a file is authentic, untouched, or free of AI involvement. Other companies use different watermarking systems, or none at all, and researchers say light edits may leave markers in place while heavy compression, aggressive filters, or regeneration can weaken them or remove them altogether.
If you need a way to check AI media, Google SynthID Detector is still useful, just don’t treat it like a final answer. It’s one more clue at a time when platforms and policymakers are both pushing for clearer labeling.
You can use Google SynthID Detector at synthid.com, and Google says SynthID checks are also built into Google Search, Google Gemini, and Google Chrome. The company also says it has watermarked 180 billion images and videos, along with about 240,000 years of audio.
Author: Jesús Bosque
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