Anthropic will embed invisible watermarks in text produced by its new Claude models and include signed provenance metadata with generated files, as detailed in a support article. Claude models launched in the EU on or after August 2, 2026 support machine-readable marking at launch. So a Claude mark can appear on copy that its publisher has no obligation to label. What Claude Marks & What It Means Text from supported Claude models Hidden watermark Supported generated files C2PA signed metadata .SVG, .PNG, .JPG Human-written text Claude processes Edits, translations, summaries, or conversions may also carry a mark. Source: Anthropic support articleWhether The Marks Survive EditingThe support article doesn’t specify how much editing is needed to remove a watermark.