Claude Watermark Remover

Claude Watermark Remover is a browser-based tool that scans pasted text for every trace Anthropic's Claude leaves behind when you copy from its chat interface. It finds hidden HTML class names containing "claude", zero-width spaces, byte-order marks, non-breaking spaces, curly quotes, and em dashes — all the artifacts that AI detectors and platforms like AO3 flag. The check runs instantly as you type, with no upload and no account needed. Once you see what is in your text, a single click strips the detectable markup, and a separate rewrite pass rephrases the prose to break the statistical patterns that give away machine-written text.

The tool works entirely in your browser for detection, so your text never leaves your machine. The rewrite engine, however, uses a different language model to vary sentence rhythm and length — the one technique Anthropic's own documentation says a watermark may not survive. The site is transparent about what it can and cannot do: it openly states that no checker can verify Anthropic's statistical watermark without the unreleased key, and it publishes its detection engine as open source on GitHub. The rewrite pass costs credits (which never expire), while the checker remains free and unlimited.

This tool is most useful for writers, students, and anyone who uses Claude and wants to avoid being flagged by AI detectors or platform-specific skins. If you paste Claude output into AO3, Google Docs, WordPress, or any other editor, the hidden HTML alone can trigger false positives. Claude Watermark Remover gives you a clear, deterministic report of what is actually in your text and a practical way to clean it. It is not affiliated with Anthropic, and it does not claim to remove the cryptographic watermark — only the detectable traces that get people in trouble.