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A SynthID check that finds no watermark does not prove a photo or video is human-made. It means the checker did not find a supported Google AI watermark; media from other AI systems, or files with too little detectable signal, can still return no result. Treat it as one clue, then check the file’s provenance and context.
What a “not detected” result means
Google Gemini Apps Help explains that when a SynthID watermark is not detected, the image or video was not created or edited by Google AI according to that check, but it could have been created by other AI systems. Gemini currently recognizes only content made by Google AI tools for SynthID. A result is therefore limited to the detector’s supported watermark scope, not a general AI-authorship verdict.
A negative result can also be inconclusive: there may not be enough detail to watermark, an edit may be too small, or later changes may have weakened the signal. Google says a watermark usually persists through common changes but may fail after many alterations. OpenAI similarly cautions that a supported-signal check can return “not detected” if metadata was stripped, a watermark degraded, the file predates provenance signals, or the content came from another company’s model.
Use wording such as “The check did not detect a supported SynthID watermark” or “No supported provenance signal was found.” Avoid saying “the image is real,” “the video is human-made,” or “AI was ruled out.” “Real” and “AI-generated” are not always opposites: authentic camera footage can also be edited with AI.
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Verify the file in a sequence
- Preserve the best available original. Use the original image or video file rather than a screenshot, collage, or re-export when possible. Originals are more likely to retain useful metadata, while ordinary editing and sharing can remove it. If a screenshot is all you have, crop tightly around the relevant image before submitting it to a checker.
- Run the supported SynthID check. Gemini can check supported images, video, and audio for Google AI SynthID. Google’s help page currently specifies one file at a time, up to 100 MB, and videos under 90 seconds. Check the current service guidance before uploading if your file is outside those limits. Interpret a negative only as a result about supported Google AI signals.
- Look for Content Credentials. If compatible credentials are available, Gemini can summarize a file’s composition, edit history, and whether AI was used. Read who provided or signed the information and which actions it records. Credentials document origin and history; Google says they do not by themselves establish that a file is definitely AI-generated. Availability depends on compatible products and versions.
- Choose another check only if its coverage fits. Google describes SynthID Detector as covering media from Google and partners, with the partner list subject to change. OpenAI Verify/API checks supported OpenAI signals in images and audio; OpenAI says it is not a general-purpose AI detector and does not cover every company’s systems. Match the service to the likely source rather than treating any provider’s “not detected” as universal.
- Investigate origin and context. Reverse-search the image to find earlier versions, similar material, or a likely original source. Compare available metadata and editing traces. Look for clues such as garbled text, inconsistent lighting or shadows, and repeating patterns, but do not treat a visual oddity as proof.
- Corroborate consequential claims independently. Seek the earliest traceable upload, check the claimed photographer or publisher, compare dates and locations with independent sources, and contact a source when practical. Provenance can support a claim about origin or editing; its absence cannot establish that an event happened as shown.
How to read each kind of evidence
| Signal | What it can support | What it cannot establish |
|---|---|---|
| SynthID detected | Google says detection indicates that all or part of an image or video was created or edited by Google AI. A video result may identify portions. | It does not mean every frame, or every moment in a reported portion, was detected. |
| SynthID not detected | The checker did not find a supported watermark in the file it examined. | It does not rule out another AI system, an unsupported format, an edit too small to detect, insufficient signal, or extensive modifications. |
| Content Credentials present | Signed information may document origin and editing history, including AI and non-AI actions. | Credentials are not a universal verdict. They may be unavailable, incompatible, malformed, or invalid; inspect the signer and recorded actions. |
| Metadata absent | It tells you that the file examined has no usable metadata available to you. | It is not proof of AI generation; metadata may disappear during ordinary editing or sharing. Metadata that is present also needs context. |
| Reverse-search match or visual irregularity | It can provide a lead to investigate an earlier source, a related image, or a possible edit. | Neither a match nor a visual clue alone proves AI or human origin. |
Why the original file matters
EXIF metadata in an original image may include camera model, date, and settings; metadata can also sometimes identify editing software. A screenshot or re-export may discard those details, and a missing record is not suspicious by itself. Even intact metadata describes information associated with the file; it does not independently prove that the depicted event occurred as claimed.
Keep the file you received unchanged if you may need to verify it later. If you investigate a working copy, distinguish it from the original so that crops, conversions, or edits do not become confused with the source file.
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What the available checks do—and do not—measure
Google reported that its SynthID verification feature had been used 50 million times globally in 2026. That is a usage count, not an accuracy rate or evidence that a particular file is authentic.
The official sources cited here do not establish a general, independently validated accuracy percentage for classifying arbitrary photos or videos. Google DeepMind’s technical explainer describes internal tests against common image manipulations and notes that SynthID is not foolproof against extreme manipulation, but it does not provide a universal accuracy rate. A detector result should therefore be reported with its scope, not as a probability that the media is genuine or fake.
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For a routine check, record which service examined which file and what it actually reported. In journalism or another consequential decision, keep the original and corroborate the content independently. A provider-specific watermark or signed provenance record can add evidence, but no single signal—or missing signal—settles whether the scene is authentic.
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