Claude Watermark Checker & Hidden Character Remover
Check text for hidden Unicode and invisible characters sometimes associated with AI text watermark discussions, then clean those formatting characters locally in your browser.
Privacy: analysis and cleaning happen 100% client-side. Your pasted text is never uploaded or sent to a server.
What this Claude watermark checker actually checks
Some text can contain invisible Unicode formatting characters that are difficult to see when copied from AI tools, websites, documents, or messaging apps. This page detects common hidden characters and can remove them while preserving normal text, spaces, punctuation, and line breaks.
- Zero-width space, zero-width non-joiner, and zero-width joiner
- Word joiner and byte order mark
- Soft hyphen
- Left-to-right and right-to-left marks
- Common bidirectional and invisible formatting controls
AI text watermark limitations
An AI text watermark does not have to be a hidden Unicode character. Statistical or language-based watermarking can depend on token choices, phrasing, or generation patterns. Removing invisible characters cannot reliably detect or defeat those systems, so this tool makes no such guarantee.