California AI Transparency Act

The California AI Transparency Act is a state law that requires makers of generative AI systems to disclose when content is AI-generated and to offer tools for verifying it. This hub tracks the law’s requirements, its rollout, and how it fits into the broader push for AI transparency and content-labeling rules across the US and beyond.

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The California State Capitol building in Sacramento, seat of the legislature that passed the AI Transparency Act

What Is California's AI Transparency Act — and Who Must Comply?

6 August 2026

California now requires large AI image, video, and audio tools to watermark their output and offer a free way to check it. Here's what the law requires, and who it covers.

The California State Capitol building in Sacramento, where lawmakers passed the state's AI Transparency Act.

California's AI Transparency Act Takes Effect, Mandates Watermarks

2 August 2026

California's AI Transparency Act took effect August 2, requiring major AI image, video, and audio generators to offer free detection tools and embed hidden origin watermarks.