Anthropic Adds Invisible Text Watermarks and C2PA Metadata to All Claude Outputs
dotey · x · 2026-08-11
Anthropic announced that starting August 2, all newly released Claude models globally will embed machine-readable markers in their outputs to comply with the EU AI Act's transparency guidelines.
The marking mechanism operates on two levels:
- Text Watermarks: Weaves invisible watermarks into generated text that persist through copy-pasting and moderate editing.
- File Metadata: Appends C2PA-compliant signed metadata to generated files like SVG and PNG.
This applies across APIs, the official website, and major cloud platforms. Anthropic is developing accompanying detection tools. This marks the first large-scale deployment of text-level watermarks by a major AI lab, contrasting with OpenAI, which has yet to deploy its developed watermarking tech.
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