# Anthropic Adds Text Watermarking to Claude for EU AI Act Compliance

> Anthropic is adding an imperceptible watermark to text produced by Claude, a change driven largely by the European Union's AI Act and its transparency rules around machine-generated content. The idea is that a hidden signal, invisible to a reader, could later be detected to flag that a passage came from the model rather than a person. Watermarking text is much harder than watermarking an image. Words can be paraphrased, trimmed, or run through another tool, and any of those steps can scrub the signal, so there is an inherent tension between making a watermark detectable and making it robust. Anthropic is effectively betting that some detectability, even if imperfect, is better than none as regulators start demanding it. The significance is less about this one feature and more about the direction of travel. As the AI Act's provisions bite, expect more labs to bolt on compliance machinery like this, and expect a quiet arms race between watermarking schemes and the tools built to strip them out. For anyone worried about AI text flooding the internet, it is a first, fragile line of defense.

_Section: [Daily AI Updates](https://www.wortins.com/daily-ai) · Source: Anthropic · Published Monday, August 24, 2026_

## Wortins' read

Anthropic is adding an imperceptible watermark to text produced by Claude, a change driven largely by the European Union's AI Act and its transparency rules around machine-generated content. The idea is that a hidden signal, invisible to a reader, could later be detected to flag that a passage came from the model rather than a person. Watermarking text is much harder than watermarking an image. Words can be paraphrased, trimmed, or run through another tool, and any of those steps can scrub the signal, so there is an inherent tension between making a watermark detectable and making it robust. Anthropic is effectively betting that some detectability, even if imperfect, is better than none as regulators start demanding it. The significance is less about this one feature and more about the direction of travel. As the AI Act's provisions bite, expect more labs to bolt on compliance machinery like this, and expect a quiet arms race between watermarking schemes and the tools built to strip them out. For anyone worried about AI text flooding the internet, it is a first, fragile line of defense.

## Source

[Read the full story at Anthropic](https://www.anthropic.com/news/claude-text-watermark)

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