Claude Watermark

Claude Watermark finds the technical artifacts that get left in text when you copy it out of an AI chat interface, and removes them.

When you copy from Claude or ChatGPT's web interface, the clipboard carries more than the words. Provider-specific CSS class names, editor state attributes, zero-width Unicode characters, non-breaking and exotic spaces, and typographic punctuation all travel with it. Paste that into WordPress, Google Docs, Outlook, Notion or a university submission form and the artifacts go too. They are invisible on screen but sitting in the source, readable by anyone who looks.

Paste your text and the checker lists every artifact it finds, with counts and an explanation of what each one is. It runs entirely in your browser: no account, no upload, no limit. Your text never reaches a server. There is also an optional paid rewrite that rephrases a passage so it reads less like unedited model output.

Who it is for: writers, bloggers and marketers who publish AI-assisted drafts and want clean HTML; students who need to know what is actually in a document before submitting it; anyone wrongly flagged by an AI detector who wants to see the evidence rather than argue with a score; and developers checking what their own tooling pastes.

What makes it different is that it tells you the truth about detection. Anthropic announced statistical watermarking for Claude models launched on or after 2 August 2026. We do not claim to remove that, anywhere. No shipped Claude model currently carries it, no public detector exists, and nobody outside Anthropic can verify whether a passage is marked or whether any removal worked. The site says so plainly, including in a guide arguing that most "Claude watermark removers" cannot work. The tool itself reports when a stage did nothing rather than implying it succeeded.

Alongside the checker there are guides covering which Claude models are watermarked, how AI detectors actually work and why they misfire, what to do about a false accusation, whether Google penalises AI content, whether recruiters can tell, and why short passages cannot be reliably judged at all. There are also platform-specific pages for AO3, Google Docs, WordPress, Word, Outlook, Notion, Substack, Canvas, Blackboard, Moodle, Slack, Teams and more, because what survives a paste depends entirely on where you paste it.

Free to check and clean, always, with no account. Credits are only spent on the optional rewrite.