isGenAI.com

AI image detector by generator

Grok AI image detector: evidence from the download

xAI publishes no documentation we could find of C2PA Content Credentials or IPTC source types in Grok image downloads as of October 2026, so isGenAI identifies a Grok image only from records found in the file or from a matching copy in its records.

Facts checked against vendor documentation in October 2026. Updated .

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Code-drawn illustration for Grok

Illustration · PNG file

  1. Signature + IHDR
  2. iTXt XML:com.adobe.xmprecord
  3. tEXt parameters
  4. tEXt prompt / workflow
  5. tEXt invokeai_metadata
  6. eXIf
  7. caBX C2PA manifest
  8. IDAT pixels
  9. IEND

AI source type declared

The file labels itself as AI-made.

IPTC DigitalSourceType such as trainedAlgorithmicMedia is read from XMP and shown with its exact value.

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AI source type declared: where this record sits inside a PNG file and what the isGenAI report says about it. The picture is a code-drawn illustration.

What is and is not documented

Third-party reports about Grok images disagree: some describe custom XMP fields, others a visible label, others a signed manifest. None of it comes from xAI, so none of it is stated here as fact. What is certain is that a hosted generator can change its export pipeline at any time without notice.

The only reliable approach is to inspect the download you have. If it carries a manifest, isGenAI validates it; if it carries XMP, isGenAI reads the declared source type; if it carries nothing, the report says so.

What isGenAI reads

The checker validates C2PA manifests, reads IPTC DigitalSourceType from XMP, quotes AI statements found in metadata, reads AUTOMATIC1111, ComfyUI and InvokeAI prompt records and compares the hash and perceptual fingerprint with its records. Every finding names its source field.

Unknown XMP fields that are not a recognised source type or an AI statement are not turned into a verdict. The EXIF viewer will still show them so you can read them yourself.

Images from X posts

Most Grok images circulate as X posts, and files saved from X are widely reported to arrive without EXIF or XMP. A Grok image downloaded from X is therefore usually stripped. Ask the poster for the original export from the Grok interface, or use the matching-copy check.

The X platform page covers what the service strips and labels.

How to check an image from this generator

  1. Get the original download, not a screenshot or a copy saved from a chat or social feed.
  2. Upload it to the free AI image detector. Files up to 20 MiB in PNG, JPEG, WebP, AVIF or TIFF are read on the server and are private by default.
  3. Open “How we checked” and read each finding with its source field: signed record, declared source type, saved prompt, AI statement or matching copy.
  4. Treat a clean result as “no evidence found”, never as proof that a person made the picture.

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Frequently asked questions

Does Grok add metadata to its images?

We found no xAI documentation as of October 2026. Third-party reports conflict, so inspect the actual download; isGenAI reports whatever records it contains.

Can isGenAI detect a Grok image saved from X?

Usually not from metadata, because files saved from X are widely reported to be stripped. The matching-copy check or the original export are the realistic routes.

Is a Grok image detectable after a screenshot?

No. Screenshots carry no file records and isGenAI does not infer origin from pixels.

What if the file has unusual XMP fields?

The EXIF viewer shows every readable field. The AI image detector reports only recognised source types, AI statements, signed records and saved prompts, so unknown fields never become a verdict.

Sources

Vendor behaviour changes. These pages describe what the vendor documents and what isGenAI reads from a file; they do not test every release.