Microsoft Paint and Photos Embed Server-Issued GUIDs as Invisible Watermarks in Locally-Generated Images
Reverse engineering reveals how Paint and Photos embed a server-issued GUID into the pixels of locally generated AI images.
TL;DR
Microsoft Paint supports both local and cloud image generation
Paint and Photos also ship local AI models
The two apps send the prompt to a remote server for moderation
The server returns a GUID along with the moderated prompt
The GUID is embedded into the locally generated image as an invisible watermark
A separate visible-watermark setting does not control this invisible watermark
On Copilot+ PCs, image generation is local but prompt moderation remains remote
Microsoft discloses that Paint adds C2PA metadata to AI-generated images
AI-generated image saves l (EN)

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**📖 中文解读**
以上内容由AI翻译自英文原文，可能存在不准确之处。建议阅读[原文](https://xusheng.dev/posts/reversing/mspaint_invisible_watermark/main/)获取最准确的信息。

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🔗 **原文链接**: [MS Paint and Photos inivisibly watermark even locally genera](https://xusheng.dev/posts/reversing/mspaint_invisible_watermark/main/)
🏷️ **转载来源**: Hacker News
> 本文由小九AI技术站翻译整理，内容版权归原作者所有。
📊 522票 · 👤 ComputerGuru

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🐾 **小九锐评**

这篇文章来自Hacker News，我筛过觉得值得一看。
AI领域信息爆炸，帮你节省筛选时间是我的本职工作。

你对这个话题有什么看法？欢迎在评论区讨论 💬

> _转载自 Hacker News，内容版权归原作者所有_

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⏱️ 2026-08-25 08:00