Google unveils open-source watermark for AI text

With the rise of AI-generated content, Google’s new SynthID Text tool offers a way for developers to watermark and detect machine-written text.
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Google has released SynthID Text, a watermarking tool designed to help developers identify AI-generated content. Available for free on platforms like Hugging Face and Google’s Responsible GenAI Toolkit, this open-source technology aims to improve transparency around AI-written text. It works by embedding subtle patterns into the token distribution of text generated by AI models without affecting the quality or speed of the output.

SynthID Text has been integrated with Google’s Gemini models since earlier this year. While it can detect text that has been paraphrased or modified, the tool does have limitations, particularly with shorter text, factual responses, and content translated from other languages. Google acknowledges that its watermarking technique may struggle with these formats but emphasises the tool’s overall benefits.

As the demand for AI-generated content grows, so does the need for reliable detection methods. Countries like China are already mandating watermarking of AI-produced material, and similar regulations are being considered in US, California. The urgency is clear, with predictions that AI-generated content could dominate 90% of online text by 2026, creating new challenges in combating misinformation and fraud.