Claude Text Watermark Checker: What This Local Tool Can Inspect
This is not Anthropic's Claude watermark detector. Your text is processed in your browser only. It is never uploaded to any server.
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This checker only reports invisible Unicode and generic surface-level writing signals. Anthropic says Claude's text watermark adds no hidden characters and requires a keyed detector. Anthropic has announced, but not yet released, a public detection API. This tool cannot detect, remove, or bypass that watermark. Read Anthropic's technical explainer.
Understand Claude Text Watermark Detection
Claude's official mark is a keyed statistical pattern, not hidden Unicode. Read the plain-English definition, learn how the watermark works, or review the 2026 rollout status.
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