Check
C2PA Checker For Claude Images
C2PA checker for Claude images is the one verification task on this site that actually works, because file provenance is designed to be readable.
Drop a file in and the manifest either exists or it does not. No interpretation, no probability, no waiting for tooling that has not shipped.
Readable, definite and offline. This is the opposite of the text-watermark situation.
Runs in your browser. No signup, no upload, nothing stored.
What a C2PA manifest contains
When Claude attaches provenance to a supported file, the manifest records structured, signed claims:
- That the file was processed by Claude
- A claim generator identifying the producing software
- A cryptographic signature over the claim
- Assertions describing actions taken on the file
Which files carry it
Anthropic lists .svg, .png and .jpg as the supported file types for signed provenance metadata.
Other formats produced by Claude may carry no manifest at all, which is one of several reasons absence proves very little on its own.
Where to look inside each format
The data sits in each format's standard metadata container, which is why reading it is deterministic rather than a matter of guesswork.
In JPEG it is a JUMBF box behind the APP11 marker. In PNG it is a dedicated caBX chunk, usually alongside XMP in an iTXt chunk. In SVG it is an embedded XML metadata element.
What the signature adds
The manifest is cryptographically signed, so tampering with the claim itself is detectable rather than silent.
Note the boundary carefully: the signature protects the claim's integrity. It does not prevent someone deleting the entire block, which removes the claim rather than breaking it — and leaves no trace that anything was there.
Why checking beats assuming
Files lose metadata constantly through completely ordinary handling. Messaging apps strip it on send, social platforms re-encode on upload, and screenshots discard everything.
So an image that genuinely came from Claude may arrive with no manifest for entirely innocent reasons. Checking tells you what this specific copy carries, which is the only question a reader can actually answer.
Do it locally
Uploading an image to a web service to read its metadata means handing over the image, which is a poor trade for information your browser can extract on its own.
The parsing involved is straightforward — walking chunk headers and marker segments — and needs no server at any point.
Source
The claims on this page are drawn from primary documentation and reporting rather than from other tools’ marketing copy.
C2PA technical specification →Related
Check what your text and files actually carry
Runs in your browser. No signup, no upload, nothing stored.