Just provide a file and ask
The app for Google's AI "Gemini" said on X on Oct. 27 (Oct. 28 Japan time) that users can find out whether an image, video or audio file was made with Google's AI by providing the file and asking whether it was made with AI.
Google embeds "SynthID," a mark that cannot be detected by eye or ear, in images, video and audio made with its AI. Gemini looks for this mark and, if it finds one, answers that the content was made or edited with Google's AI. For video, it even shows which scenes' visuals or audio contain the mark. If there is "Content Credentials" information, which records the history of a file's creation and editing, it shows that as well.
Up to 10 checks a day, cannot identify other companies' AI
Users can provide one file at a time, up to 100MB, with video under 90 seconds and audio under one hour. They can run about 10 checks each for images, video and audio per 24 hours.
Even if no mark is found, that does not mean the content was not made with AI. Gemini can identify only content made with Google's AI and cannot judge content made with other companies' AI. The mark may become undetectable after repeated editing.
Google added checks for images, followed by video, to the Gemini app in 2025. "Genie 4," the world-building AI announced on Oct. 27, also embeds SynthID in its visuals and sound.
