Unofficial. Not affiliated with Anthropic.
Claude watermark remover
Anthropic describes Claude’s watermark as a pattern chosen with a secret key and prior context. Readers do not see it. A zero-width cleanup cannot reveal or remove that signal.
Scan to list hidden characters. Your text stays in this tab.
Why character cleanup is not enough
Sites that only delete invisible Unicode address a different problem. Claude’s published watermark lives in word choice. This page still offers a free character scan and strip for hidden Unicode that can appear in copied text.
Free and paid on this site
Free: scan and strip hidden characters in your browser. Paid rewrite (when enabled later): change wording. Neither step can read Anthropic’s key, and neither promises a detection outcome.
FAQ
Did Anthropic say the watermark changes quality?
They report no meaningful quality change in their tests. That says nothing about whether a third party can see the pattern.
Can this site tell me if Claude wrote a paragraph?
No.
