Content Credentials and AI watermark checker

Check a picture for AI marks

See whether a picture carries Content Credentials (C2PA) and an invisible TrustMark watermark, ours or anyone's, and what they say about how it was made. The check runs in your browser: the picture never leaves your device.

Choose a picture, or drop it here

PNG, JPEG or WebP, up to 25 MB. It stays on your device.

How it works

Content Credentials are read with the Content Authenticity Initiative's own library, running here as WebAssembly. Ours show as signed by Kennmarq.com; others show as valid from their signer.
The watermark is read with TrustMark's decoder, also running here. The first check downloads it once (48 MB); your browser keeps it.
Only identifiers reach us, and only when there is one: a watermark ID, to find the Content Credentials it was signed with when a file lost its metadata, and a manifest's label, to show its entry in our transparency log. Your browser checks that entry's proof itself.

For a result signed by us, with the file's SHA-256 and the time, use POST /v1/verify: it uploads the file to our servers in Zurich, which read it in memory and keep nothing.