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Wednesday, September 2, 2026 · UTC
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Anthropic to Embed Undetectable Watermarks in Claude AI Outputs

Anthropic will add invisible watermarks to Claude models to comply with the EU AI Act.

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Anthropic announced on Monday that its new Claude models launching from 2 August will carry embedded watermarks undetectable to the human eye. [1] A new online tool allows users to upload files to check for signs that the AI model Claude helped create or edit them. [2] Anthropic said in a help document published on its website that generated text will carry embedded watermarks and generated files will include digitally signed provenance metadata where supported. [3] Anthropic stated that the watermarks will be detected by machines if the text is copied and pasted from Claude, and some may survive editing. [4] The company stated that the move to add watermarks is a response to transparency requirements under Article 50 of the European Union's AI Act. [5] If the tool finds a C2PA credential that points to Claude, it will inform the user that the content was processed by the AI. [6] The tool checks for a C2PA content credential, which is a record attached to a file when it is made or edited to show what created or changed it. [7] A missing signal from the tool does not confirm that the content was not made with Claude, as the signal might have been removed or the content produced by a model that does not support marking. [8]
What this stands on
  1. Anthropic announced on Monday that its new Claude models launching from 2 August will carry embedded watermarks undetectable to the human eye. · mint
  2. A new online tool allows users to upload files to check for signs that the AI model Claude helped create or edit them. · Claude
  3. Anthropic said in a help document published on its website that generated text will carry embedded watermarks and generated files will include digitally signed provenance metadata where supported. · mint
  4. Anthropic stated that the watermarks will be detected by machines if the text is copied and pasted from Claude, and some may survive editing. · mint
  5. The company stated that the move to add watermarks is a response to transparency requirements under Article 50 of the European Union's AI Act. · mint
  6. If the tool finds a C2PA credential that points to Claude, it will inform the user that the content was processed by the AI. · Claude
  7. The tool checks for a C2PA content credential, which is a record attached to a file when it is made or edited to show what created or changed it. · Claude
  8. A missing signal from the tool does not confirm that the content was not made with Claude, as the signal might have been removed or the content produced by a model that does not support marking. · Claude
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