81 points•52 comments•4h ago•by frexs•claude.com ↗

Check if a file was made with Claude

A web tool lets you upload a file to check for signs that Claude helped create or edit it by reading a C2PA content credential embedded in the file. If a credential points to Claude, the tool reports it; a missing signal does not prove Claude was not involved, since signals can be removed or unsupported by some formats. The service runs in your browser, supports many formats up to 100 MB, and your file stays on your device while only the embedded credential is read.

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