Microsoft Paint and Photos apps add invisible watermark to AI-generated content — developer reverse engineers GUID embedding

Tom's Hardware
Aug 26, 2026, 6:30 am183 ptsTrendingTop
Developer Xusheng Li has uncovered some previously unknown functionality deep within Microsoft’s Paint and Photos apps. The findings concern GUID watermarks. While these programs clearly add Copilot logo watermarks to images where LLM image generation has played a part in the process, Li also uncovered an…

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