Anthropic has introduced an invisible text watermark for Claude-generated text alongside digitally signed provenance metadata for generated files. The change is designed to make AI involvement more transparent, particularly in response to European AI transparency requirements. For publishers, marketers, and website owners, the important distinction is straightforward: a watermark can indicate that Claude was involved in producing content, but it cannot determine whether that content is accurate, useful, original, or fit to publish.
According to Anthropic's official explanation of Claude's text watermark, the company uses two complementary marking methods. One is embedded directly in model-generated text. The other adds provenance metadata to generated files, such as images, using the Coalition for Content Provenance and Authenticity (C2PA) standard.
The rollout matters because content provenance is moving from a policy discussion into product infrastructure. Claude's watermark is applied at the model level, rather than being limited to one interface. Anthropic says it therefore applies across Claude products and services, including the Claude Platform API, Claude, Claude Code, Claude Cowork, and Claude Tag, as well as Claude access through cloud partners such as AWS, Google Cloud, and Microsoft Foundry.
