C2PA Signer

Sign C2PA on JPEG/PNG. Create a test cert or import .p12/.pfx. Verify images, PDFs, videos and scan page media.

Overview C2PA Signer helps you verify, understand, and test-sign Content Credentials directly in Chrome. No file upload required. Why use C2PA Signer for your Content Credentials? ➤ Verify local files securely Inspect supported images, documents, and videos to detect Content Credentials (C2PA). Instantly see whether credentials are present, valid, trusted, invalid, or missing. ➤ Scan web pages effortlessly Analyze supported visible media in your active browser tab. The extension displays clear status badges. Scanning is manual by default, with an optional automatic scan mode available. ➤ Test C2PA signing workflows locally Create a local test certificate for demos, development, and validation workflows. Ready to use your own identity? Simply import supported signing material, such as .p12 or .pfx files. ➤ Understand the trust chain Access a detailed report including manifest data, C2PA actions, certificate information, trust chain status, and exportable JSON data. ➤ Local-first by design C2PA Signer runs entirely locally. Verification and signing are performed inside your browser. Your files and signing identities are never sent to a remote C2PA Signer server. ➤ No tracking, no ads No ads. No resale of user data. No unnecessary profiling. Your work stays yours. Key Features of C2PA Signer ✔️ Detailed inspection of C2PA manifests. ✔️ Integrity verification for digital media. ✔️ Secure media scanning directly on web pages. ✔️ Cryptographic test-signing without cloud dependency. ✔️ Easy JSON data export. Important Limitations to Understand C2PA Signer does not decide whether content is “true” or “false”. The extension only verifies cryptographic provenance and integrity signals. ✔️ Unsigned content is not automatically fake. ✔️ A valid test signature is not the same as a publicly trusted production signature. About test certificates Test certificates are intended for learning, demos, and internal validation only. For public trust, always use a certificate chain recognized by the C2PA trust ecosystem. Privacy and Security C2PA Signer is committed to protecting your privacy. The extension is built around a local-first principle. Your local files and signing workflows stay inside your browser. We do not collect, store, or share your media.