Anthropic explains how Claude’s invisible text watermarks will work
It’s using ‘a version’ of the open-source SynthID-Text system Google developed.
by Jess Weatherbed
Aug 17, 2026, 10:57 AM UTC
Image: Cath Virginia / The Verge, Getty Images
Jess Weatherbed is a news writer focused on creative industries, computing, and internet culture. Jess started her career at TechRadar, covering news and hardware reviews.
Anthropic has clarified how it’s planning to apply invisible watermarks to Claude-generated text in order to comply with Europe’s AI transparency rules. On Friday, Anthropic announced that Claude’s text marking system is “a version of the SynthID-Text approach” — an open-source watermarking technology developed by Google DeepMind that creates detectable patterns using wording probabilities.
This watermarking feature, alongside C2PA support for Claude-processed images, is being introduced to meet Anthropic’s obligations under the European Union’s AI Act, which requires synthetic audio, image, video, and text to include machine-readable marks that enable the content to be detected as...
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