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To check an image, use an official Google verification route: upload it to the SynthID Detector, upload it to Gemini and ask Was this created with Google AI?
, or use a SynthID check exposed in Google Search or Chrome when that control is available. A positive SynthID result means Google AI created or edited all or part of the image. A result saying that SynthID was not detected does not prove the image is human-made or authentic.
SynthID is an invisible watermark in the image data, not a visible badge and not a general-purpose AI detector. The most reliable way to interpret a check is therefore narrow: it tells you whether Google’s watermark signal was found, subject to the system’s limits and the way the file has been altered.
What a SynthID check can—and cannot—tell you
SynthID is Google’s watermarking system for media generated or edited by participating Google AI models. The watermark is designed to be imperceptible, so you will not normally see a logo, corner label, or special metadata field in the picture. Detection technology looks for the signal in the image itself.
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- Watermark detected: Google AI created or edited all or part of the image, according to Google’s Gemini Help explanation.
- Watermark not detected: the service did not find a SynthID signal in the submitted file. This is not a finding that the image is genuine, camera-made, or free of non-Google AI editing.
- Possibly detected: an uncertain signal. Treat it as inconclusive rather than converting it into a definite positive.
SynthID is targeted at Google’s watermark, so an image made by another system may have no SynthID even when it is AI-generated. Conversely, a real photograph that was later edited with a Google AI feature can produce a positive result because the question is about Google AI involvement, not the image’s original capture method.
Choose an official checking route
| Route | What Google describes it for | Best use | What to keep in mind |
|---|---|---|---|
| SynthID Detector | A standalone portal for checking images, video, and audio for SynthID associated with Google or named partners. | A dedicated verification check when you want a result focused on SynthID. | Google announced global availability in English on October 7, 2026. The current interface, accepted formats, and access conditions can change. |
| Gemini | Upload an image and ask a natural-language question. Google says Gemini can check SynthID and provide context; it can also verify compatible Content Credentials separately. | A conversational check when you want the watermark result explained alongside other context. | Visual reasoning from Gemini is not the same evidence as a SynthID match. Use the watermark finding as its own layer of evidence. |
| Google Search or Chrome | Google lists Search and Chrome as surfaces that can check whether content carries a SynthID watermark. | A quick check when the relevant control appears in the product you are already using. | Exact labels and steps depend on the product version. Do not assume that every Search result or every Chrome build exposes the same control. |
For one image, start with the simplest official interface available to you. Do not install a generic “AI detector,” metadata utility, or photo editor as a substitute for SynthID verification; those tools answer different provenance questions.
How to use the SynthID Detector
Google’s October 7, 2026 announcement describes the Detector as a global English service that accepts images, video, and audio for SynthID checks associated with Google or named partners. Use the following workflow, while checking the current Detector page for any updated controls.
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- Open the official SynthID Detector. Use Google’s current Detector entry rather than an unrelated service claiming to identify AI images.
- Select the upload control. Choose the image file you want to examine. If you are checking a video or audio item instead, select that file type only when the current interface offers it.
- Submit the original file when possible. A copy that has been repeatedly re-saved, heavily filtered, or otherwise transformed may be harder to evaluate than the file you received.
- Wait for the result. Record the wording exactly: detected, not detected, possibly detected, or any newer equivalent label. Google has used three confidence states in its explanations, and interface terminology may evolve.
- Apply the narrow interpretation. A detection indicates a SynthID signal associated with Google AI involvement. A non-detection means only that the signal was not found in that submission.
The Detector is not a certificate of authenticity. If the image is being used for a legal, journalistic, safety, or financial decision, preserve the original file and any surrounding evidence instead of relying on one automated result.
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How to check an image in Gemini
Gemini provides the most natural-language workflow. Google’s documented example prompt is Was this created with Google AI?
You can use that exact wording after attaching the image.
- Open Gemini and start a conversation.
- Attach the image. Use the product’s image-upload control and wait until the attachment is visible in the conversation.
- Ask the documented question:
Was this created with Google AI?
You can ask a follow-up question for clarification, but keep the SynthID question separate from requests for an opinion about whether the picture merely looks artificial. - Read the answer for the watermark finding. Identify whether Gemini says SynthID was detected, not detected, or possibly detected. Do not treat a descriptive comment about lighting, anatomy, or visual style as a watermark result.
- Save the response with the file. If the check matters later, retain the original image and the date of the Gemini response; product wording can change.
Gemini may add contextual reasoning to its answer. That can help explain what you are seeing, but it does not expand a SynthID result into a universal AI-authorship verdict. A statement that an image “looks AI-generated” is not equivalent to finding Google’s watermark.
Checking through Google Search or Chrome
Google’s current SynthID overview lists Search and Chrome among the places where people can check for a SynthID watermark. Because Google can move these controls or change their names, use the following as a decision pattern rather than a promise of one fixed button label.
- Open the image in the Google product where you encountered it.
- Look for an image-information, verification, or “check with SynthID” action supplied by Google.
- Run the check and read the product’s qualification, not just a color or icon.
- Apply the same interpretation used by the Detector: detection is evidence of a SynthID signal; non-detection is not proof of human authorship.
If no SynthID control appears, do not infer that the image has passed. It may reflect a product-version difference, a file type that is not supported in that surface, or a rollout that is unavailable to your account or region. Use the dedicated Detector or Gemini instead when those routes are available.
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How to interpret each possible result
“SynthID detected”
This is the clearest positive finding. It means the submitted image contains a SynthID signal that the service associates with Google AI creation or editing. The result can cover a partially AI-created image, an image modified by an AI edit, or an image whose original non-AI content was later changed with a Google model.
Do not rewrite the finding as “Google made the entire picture,” “the picture is fake,” or “the person in it does not exist.” SynthID does not by itself establish the image’s subject, date, location, truthfulness, or degree of alteration.
“SynthID not detected”
This means the check did not detect the watermark in the file you supplied. It does not establish that the image came from a camera, that no AI system was involved, or that the file has not been manipulated. A non-Google generator would not be expected to carry Google’s watermark, and transformations can affect detection.
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Use cautious language: “The service reported a possible SynthID match.” Do not present an uncertain result as confirmed provenance. If the distinction matters, check the original file through another official Google surface and compare the wording, while remembering that two checks still do not turn an uncertain signal into independent proof.
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Why a negative check is not an “AI-free” verdict
Google DeepMind’s technical explanation says SynthID is designed to withstand common changes such as filters, color and brightness adjustments, and lossy compression. Those are design goals, not a guarantee for every edited image. The same explanation states plainly: “SynthID isn’t foolproof against extreme image manipulations.”
Extreme changes can include transformations that substantially alter the pixels carrying the signal. The official material does not establish a universal list of edits that will always remove or preserve the watermark, nor does it provide a numerical false-positive or false-negative rate. Avoid claiming a percentage accuracy or promising that a particular crop, resize, screenshot, or re-encoding will definitely be detected.
For a negative result, phrase the conclusion narrowly: “SynthID was not detected in this file.” If you need to establish what happened to an image, combine that statement with independent evidence such as the original source, publication history, creator records, or compatible provenance data.
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SynthID and Content Credentials are different checks
Content Credentials, commonly associated with the C2PA standard, describe media history and transparency. SynthID is an imperceptible watermark signal. They can complement each other, but one does not replace the other.
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| Feature | SynthID | Content Credentials |
|---|---|---|
| Primary mechanism | Signal embedded in the media’s pixels or other media data and detected by SynthID technology. | Structured provenance information describing compatible creation or editing history. |
| Question answered | Does this submission carry a SynthID signal associated with Google AI? | Does the file contain compatible, verifiable information about its recorded history? |
| What a positive result means | Google AI created or edited all or part of the image, according to Google’s interpretation. | The file’s compatible credentials can be verified; the details depend on what the credential records. |
| What a negative result means | SynthID was not detected; this is not proof of authenticity. | No compatible credential was verified; this is not proof that no provenance exists elsewhere. |
Google says Gemini can verify compatible Content Credentials separately from checking SynthID. Ask which evidence layer Gemini is describing when a response mentions both, and do not merge a credentials result with a watermark result.
Availability and scale reported by Google
In its October 7, 2026 announcement, Google reported that the standalone Detector was globally available in English for images, video, and audio checks associated with Google or named partners. That announcement also reported:
- More than 180 billion images and videos watermarked.
- About 240,000 years of audio content watermarked.
- More than 1 million verification requests per day across built-in Search, Gemini, and Chrome features.
These are figures reported by Google and Google DeepMind, not independently audited measurements. They describe the scale Google reported at that time, not a promise about current uptime, processing speed, account requirements, upload limits, or availability in every country.
A practical workflow for important images
Use this sequence when the result will influence a publication, investigation, moderation decision, or business action:
- Preserve the evidence. Keep the original download or attachment, its filename, and the surrounding message or page. Work from a copy for any conversion.
- Run an official SynthID check. Use the Detector, Gemini, or a current Search/Chrome control.
- Write down the exact result. Include whether it was detected, not detected, or possibly detected and the date of the check.
- Check for Content Credentials separately. If Gemini reports compatible credentials, distinguish that finding from SynthID.
- Compare the result with the image’s provenance. Look at where the file came from and whether the sender or publisher can provide an original capture or editing history.
- State only what the evidence supports. For example, “Google’s SynthID check detected a watermark” is supportable; “this image is completely fake” is not established by SynthID alone.
Common mistakes to avoid
- Confusing appearance with detection: visual oddities can prompt a check, but they are not proof of a SynthID watermark.
- Calling a non-detection proof of human work: SynthID is not a universal detector for other AI systems.
- Ignoring partial edits: a positive result can mean that only part of an otherwise real image was AI-created or AI-edited.
- Treating credentials and watermarks as interchangeable: they record different kinds of provenance evidence.
- Overstating resilience: Google describes resistance to common changes but acknowledges that extreme manipulation can defeat detection.
- Assuming every interface is identical: Search, Chrome, Gemini, and the standalone Detector can have different controls and supported media types.
- Inventing precision: Google’s cited material does not establish a universal accuracy percentage, country-by-country access rule, file-size limit, or guarantee for every altered image.
What to report when you publish or share a result
Use wording that preserves the scope of the check. A positive report can say: “The submitted image produced a SynthID detection, indicating that Google AI created or edited all or part of it.” A negative report can say: “The check did not detect SynthID in the submitted file.” If the service returns an uncertain state, say that it reported a possible match.
Include the checking surface and date when the distinction matters, because Google’s interfaces and labels can change. Keep the original file available so another person can repeat the check without relying on a screenshot of your result.
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