How Claude’s Invisible Watermark Works, and It’s Not Zero-Width

Claude welcome screen on a phone beside the Claude wordmark

So Anthropic started watermarking every Claude output. And honestly? I had the same thought everyone else did. When I first heard about it, I assumed they were doing the usual trick. Zero-width characters, invisible Unicode, weird spaces that look normal but aren’t. That’s what every other “watermark” has been. That’s what I would have done … Read more

Can You Remove Anthropic’s Watermark? What Detection Can Do

Magnifying glass over a glowing translucent sheet on a dark background

I’ve been watching the reactions to Anthropic’s watermark announcement for the past few days, and honestly? Most of the hot takes are missing the point. The short version is this: Starting August 2, 2026, all new Claude models will embed machine-detectable watermarks in generated text. Images and SVGs get C2PA metadata signatures too. It applies … Read more