Claude’s Invisible Watermark Isn’t What You Think. Here’s How It Works

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 if … Read more