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Claude Watermark Detector & Remover

Check text for possible Claude AI involvement and understand how Claude's text watermark works

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Browser-based tool to detect Claude AI text watermarks, understand how they work, and rewrite text naturally with an AI humanizer.

The story so far

Screenshot of the Claude Watermark Detector & Remover homepage
Homepage of Claude Watermark Detector & Remover

Claude Watermark Detector & Remover is an educational tool that helps users check text for possible Claude AI involvement, understand how Claude's SynthID-style text watermark works, and rewrite text naturally. The tool explains that Claude's watermark is created through the random process used to choose among plausible next tokens, not through hidden characters. It provides a browser-based interface for analyzing text and connecting to a humanizer API to create a seamless workflow from detection to rewriting. The site emphasizes a science-first approach with clear methodology and privacy-first design.

Typeset features

  • Detect possible Claude-style watermark signals
  • Explain how Claude's SynthID-style watermarking works
  • Analyze text up to 30,000 characters
  • Display AI-likelihood heuristic score
  • Connect to humanizer API for rewriting
  • Clear detector labeling

Pricing

Pricing model: Free

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Questions and answers

Does Claude put invisible characters in AI-generated text?

No. Anthropic explicitly says its text watermark does not add hidden characters. The watermark is created through the random process used to choose among plausible next tokens.

Does rewriting remove a Claude watermark?

Anthropic says light editing may not remove the watermark completely, while a complete rewrite in which every word is replaced will. Rewritten text should be treated as new wording, and no third-party tool should promise a guaranteed result without an official detector.

How does Claude watermark detection work?

A key-based detector checks whether the sequence of tokens is statistically consistent with the pseudo-random token-selection pattern generated from Claude's watermark key and the preceding context.

Does Claude watermark translations?

Yes. Anthropic says translations produced by Claude can carry the watermark because Claude chooses the wording throughout the translated passage.

Can an em dash reveal a Claude watermark?

No. Punctuation style may be a writing clue, but it is not the official watermark. Removing em dashes does not directly remove the SynthID-style statistical signal.

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