Claude Watermark
Check and clean AI text artifacts
Paste your text, get it checked and cleaned. Claude Watermark finds the artifacts that give AI-assisted writing away — the hidden HTML classes Claude's web UI leaves behind when you copy out of it, zero-width and exotic Unicode characters, smart punctuation and em dashes — then rewrites the passage so it reads like a person wrote it. Straight answers on Anthropic's text watermark too: what it actually is, which models carry it, and what genuinely removes it. Including the part most tools won't tell you, which is that no shipped Claude model carries the mark yet.
Features
Artifact check — finds Claude's copy-paste HTML classes, zero-width characters, exotic spaces and smart punctuation
Human rewrite — restructures the passage, then a second pass repairs meaning and citations
Em dash replacement, on by default
A live table of which Claude models carry Anthropic's watermark and which do not
10 free credits on signup, no card
Use Cases
You drafted with Claude and want it to read as your own voice before you hand it in
You pasted from Claude's web UI into a CMS or AO3 and want the leftover markup gone
You want to know whether Anthropic's watermark applies to the model you actually used
You want a straight answer instead of a tool promising to remove something that isn't there yet
Comments
I built this after the Anthropic watermarking news broke and I noticed that almost every tool ranking for "Claude watermark remover" was solving a different problem. Anthropic's mark is distributional — a keyed bias on token selection — so the signal is the word choice itself. Stripping zero-width Unicode, which is what most of those tools do, cannot touch it. So I wrote the honest version. Two things I'll say against my own interest: no shipped Claude model carries the mark yet (it applies to models launched on or after 2 Aug 2026, and nothing qualifies), and Anthropic hasn't published a detector, so nobody outside Anthropic can verify a passage is marked — which means nobody can verify a removal worked either, including me. What the tool does do is real: it finds the artifacts that actually give AI-assisted text away — the HTML classes Claude's web UI leaves in your clipboard, zero-width characters, exotic spaces, smart punctuation — and rewrites the passage so it reads like you. Happy to go into the tournament-sampling detail if anyone's curious.
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Comments
I built this after the Anthropic watermarking news broke and I noticed that almost every tool ranking for "Claude watermark remover" was solving a different problem. Anthropic's mark is distributional — a keyed bias on token selection — so the signal is the word choice itself. Stripping zero-width Unicode, which is what most of those tools do, cannot touch it. So I wrote the honest version. Two things I'll say against my own interest: no shipped Claude model carries the mark yet (it applies to models launched on or after 2 Aug 2026, and nothing qualifies), and Anthropic hasn't published a detector, so nobody outside Anthropic can verify a passage is marked — which means nobody can verify a removal worked either, including me. What the tool does do is real: it finds the artifacts that actually give AI-assisted text away — the HTML classes Claude's web UI leaves in your clipboard, zero-width characters, exotic spaces, smart punctuation — and rewrites the passage so it reads like you. Happy to go into the tournament-sampling detail if anyone's curious.
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