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Nano Banana Checker: Gemini Image Markers and SynthID Steps

Find the credit line, IPTC label and Content Credentials that Gemini's image models write, without uploading, then check SynthID in Gemini itself.

Drop a Gemini or Nano Banana imageChoose a Gemini or Nano Banana imageor click to choose one, or paste an imageTap here to pick one from your photos or files · JPEG, PNG, WebP, HEIC, AVIF, MP4, MOV, MP3, WAV, M4A · read on your device, never uploaded

What a Gemini image carries

Images from Google’s Gemini image models, better known as Nano Banana, can carry three kinds of markers besides the SynthID watermark in their pixels:

  • IPTC digital source type trainedAlgorithmicMedia (“created using generative AI”), stored as XMP.
  • The credit line “Made with Google AI”, also IPTC, which some apps show next to the photo.
  • C2PA Content Credentials signed by Google LLC. Google added them to Nano Banana Pro images in the Gemini app, Vertex AI and Google Ads from about November 2025, and Google Cloud lists gemini-2.5-flash-image, gemini-3-pro-image and the gemini-3.1 image models among the models whose output it signs, naming “Google Media Processing Services” as the app.

Reading the result

Google AI markers found with credentials “signed by Google” means a certificate on the C2PA trust list vouches for the file’s origin. Markers without a signature, such as the credit line, are a claim that anyone could have written. If an image was edited in Photoshop or another app after Gemini made it, the credentials may be marked invalid or list the Gemini image as an ingredient.

No AI markers in the metadata is the usual result for images posted on social networks, sent through messaging apps or screenshotted. The SynthID watermark survives most of those, so the next step is Gemini: upload the image and ask “Was this image created or edited by Google AI?”.

For any other file, use the SynthID checker.

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