Anthropic introduces invisible watermarks to all Claude output
Anthropic is introducing invisible watermarks and signed metadata to all content generated by Claude. The move is an adaptation to the EU AI Act and is being rolled out globally.
What happened?
AI company Anthropic is introducing invisible watermarks and signed metadata for all content created by the Claude AI model. This measure ensures that machine-generated or processed text will contain machine-readable traces, enabling the identification of its origin. The technology encompasses Claude via the website, the API platform, Claude Code, Claude Cowork, Claude Tag, and cloud-based services.
Key facts
| EU AI Act-deadline | 2 augusti 2026 |
|---|---|
| Tekniska metoder | Osynlig vattenstämpel och signerad metadata |
| Tillämpningsområde | Globalt (Webb, API, Claude Code, molntjänster) |
Why it matters
The initiative follows Anthropic's commitment to the EU AI Act's code of conduct regarding transparency for AI-generated content (Article 50.2). The goal is to increase transparency surrounding AI-created material, facilitate the detection of automatically generated text, and counteract the spread of unclear or misleading content on the internet.
Who is affected?
The decision impacts all developers, businesses, and private individuals using Claude's services globally. Content creators and systems developers can expect text generated via Anthropic to carry invisible markers that can be identified by external tools.
Impact on the EU
The labelling is being introduced as a direct response to requirements in the EU AI Act (Article 50.2). Models launched in the EU from 2 August 2026 will support the machine-readable labelling from their first day of release, but the functionality is being rolled out globally.
What else you should know
The system combines two distinct methods for traceability. The first is an invisible watermark embedded directly into the AI text, and the second is signed metadata that verifies the content was created or processed by Claude.
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