In a recently published support page, Anthropic says that new Claude models launched in the EU on or after August 2, 2026 will support adding watermarks to the content they create or edit, and that it’s working to add watermarking abilities to previously launched Claude models.
The watermarking mandate stems from the EU AI Act, which includes a provision boosting the transparency of content that was created or “processed” by AI.
Anthropic says it will deploy Claude’s watermarking abilities worldwide and across all Claude products, including Claude Cowork, Claude Code, and the Claude API, to comply with the law.
When it comes to marking text, Anthropic says a “supported” Claude model “weaves an imperceptible watermark into the text itself,” and that the mark will remain present after the text is copied and pasted, or even after “some” editing.
Meanwhile, Claude will attach “provenance” metadata to certain files it creates, including SVG, PNG, and JPG files.
Anthropic says it plans on releasing tools that allow anyone to detect the watermarks, with details on those tools slated to arrive in “forthcoming” announcements.