Unmark
Remove AI watermarks (SynthID and Claude)
What it does
AI text is now getting watermarked by default: Google's SynthID, and now Claude (to meet the EU AI Act). Unmark removes both kinds of mark: it strips invisible Unicode characters (zero-width spaces, joiners, tag chars, homoglyphs) instantly in your browser, and rewrites the wording to disrupt statistical/SynthID-style watermarks. Everything for free without any login.
Free AI watermark remover. Rewrite AI text to erase SynthID, Claude & statistical watermarks and strip invisible characters — no signup, in your browser.
SynthID and other statistical watermarks hide a detectable fingerprint in AI text. Unmark rewrites it away while keeping your meaning — and flags the formulaic AI phrases worth editing out. No account, no setup — paste, remove, copy. Works with text from ChatGPT, Claude, Gemini and any other AI. New here? Read the full guide to removing AI watermarks . Drop in text from ChatGPT, Claude, Gemini, Copilot or anywhere else. Unmark scans it for hidden characters instantly, in your browser. Pick a strength and hit Remove watermark. Unmark rewrites the wording to break the SynthID / statistical watermark, and strips every invisible character in the same step. Copy or download watermark-free text…from unmark.dev
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