Content Credentials

C2PA Detector for AI Image Provenance

Use this C2PA detector to read Content Credentials, the signed records that can describe how an image was created or edited. Slop or Not reads the credential, validates signatures from recognized issuers, and reports the source it recognizes, then scores the pixels with a classifier when no readable provenance resolves the file. Online checks stay away from outside AI companies.

A SynthID checker finds watermarked images. Slop or Not also checks the ones nobody watermarked.

It reads SynthID from Google and OpenAI images, verifies C2PA Content Credentials, reads generator fingerprints, and scans the pixels.

You can testPhotos, screenshots, product images, receipts, and profile pictures up to 8 MB.
ResultA probability verdict, AI score, and source details when the file carries them.
PrivacyChecked on hardware we own and run. We never pass your photo to OpenAI, Google, or any other AI company.

What it checks

Read Signed Content Credentials Before Trusting a Score

Signed Content Credentials embedded in the file

Generator, editor, and action history from readable manifests

Image classifier output when no readable provenance or watermark resolves the file

Good Uses

Checking whether a file came from ChatGPT, Firefly, or Designer
Reviewing provenance before publishing an image
Explaining why a screenshot lost its original content history

Limits to Know

Credentials can be stripped by screenshots or file conversions
Strong provenance evidence requires a validated signature, a trusted or recognized signer, and a relevant assertion
A missing credential proves nothing, and even trusted provenance does not prove authorship, ownership, content truth, every-pixel AI origin, or an unchanged history

FAQ

C2PA Detector Questions

What is C2PA?

C2PA is the standard behind Content Credentials: a signed record that can describe how an image was created or edited and which tool made the claim.

Is a C2PA match stronger than an AI score?

Yes, but only when its signature validates, the signer is trusted or recognized, and a relevant assertion supports the claimed history. Slop or Not reports the source it recognizes from a credential; verify the full signer and assertion chain in a dedicated C2PA viewer before leaning on it. The image score remains separate and still helps when no readable provenance resolves the file.

Can C2PA metadata be missing from AI images?

Yes. Screenshots, uploads, and file conversions can remove C2PA metadata. That is why Slop or Not also checks the image itself.

Does Claude add Content Credentials to images?

Yes. Supported image files made or processed with Claude can carry a signed C2PA Content Credential. Slop or Not reads the credential and reports the source it recognizes. A credential whose recorded history points to Claude can support Claude involvement, but the reader must make that interpretation; verify the signer and assertion chain in a dedicated C2PA viewer when it matters. Pixel analysis is separate and takes over when no readable provenance or watermark resolves the file.

Run the Next Check on Your iPhone or Mac

The Slop or Not app checks images and text on-device, so nothing you check ever leaves your device.

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