AI Text Watermarking Is Free And Good
Don't Worry About the Vase
Read full postScott Aaronson and Hendrik Kirchner developed a near-costless AI text watermarking method that subtly encodes outputs using a secret key-based pseudo-randomness source. Google has implemented this since 2024, and Anthropic recently adopted it to comply with the EU Code of Practice, enabling public detection without affecting output quality.

- AI text watermarking and quality loss· Hacker News
- AI Labels Are Big Tech's Most Basic Responsibility, Even Those Claude Watermarks· CNET
- I created a viral AI watermark remover. I wasn't ready for all the attention.· Business Insider
- Claude Watermarks AI-Generated Text· Hacker News
- People Are Rushing to Find Ways to Remove Claude’s AI Text Watermark· 2 sources
- Anthropic’s AI watermark has already spawned tools to remove it· 2 sources


