Katamereka Tools – There’s no single button that proves whether a picture was made by AI. What you can do is check for hidden watermarks and origin labels, then look at where the image came from, and together those usually tell you a lot.
This explainer covers Google’s SynthID check in the Gemini app, the C2PA “Content Credentials” standard, and Google Search’s image details, using Google’s own help pages checked October 27, 2026. Each one catches some AI images and misses others.
Three Kinds of Evidence
Before using any tool, it helps to know what each one actually looks for.
| Evidence | What it is | Main limit |
|---|---|---|
| Invisible watermark (SynthID) | A hidden signal Google’s AI adds to its images | Only detects Google AI content |
| Content Credentials (C2PA) | Attached data showing how a file was made and edited | Many images don’t carry it |
| Image details in Search | Labels drawn from file metadata and origin data | Appears only when someone supplied it |
None of these can prove an image is real. They can only show that some AI involvement was recorded.
Ask Gemini to Check for SynthID
SynthID is an invisible watermark that marks content made or edited by Google’s AI models, according to Google‘s Gemini help page.
- Go to gemini.google.com on a computer and sign in.
- Click Add files and upload the image.
- Ask “Is this AI-generated?” or “Was this created or edited by Google AI?”
The result reads as watermark detected, not detected, or unclear. Google says the watermark usually survives resizing, recoloring, and compression, though heavy editing can break detection.
The big caveat is in Google’s own words: Gemini can only recognize content created by Google AI tools. “No watermark” doesn’t rule out an image from another company’s generator.
Google limits checks to about 10 images per rolling 24 hours, one file at a time, 100 MB or smaller.
Look for Content Credentials
C2PA is an industry standard that records where content came from and how it was edited. Google lists it as one of the sources behind its own image labels.
These credentials show origin and edit history, but Google notes they don’t by themselves confirm whether something is AI-generated. They also only help when the data travels with the file, and Google says origin data exists on only some images.
Check the Image Details in Google Search
Google Search can show details for some images, including whether AI or a camera produced them, based on C2PA data or SynthID.
Google is clear about the limits. Those details appear only when the owner supplied them or origin data is attached, so a missing label means nothing either way.
When the Tools Don’t Answer
Plenty of images online carry no watermark and no credentials. Then context is your best evidence.
- Find the earliest version you can, and see who posted it first.
- Check whether a news organization or official account shared the same picture.
- Be extra skeptical of images timed to breaking news or designed to make you angry.
Say a dramatic disaster photo appears an hour after an event, from an account that posts nothing else. Wait for confirmation before sharing it.
Treat “I couldn’t detect AI” as “I don’t know yet,” never as “it’s real.”
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