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Remove ChatGPT watermarks & hidden characters

Unlike Google and Anthropic, OpenAI hasn't publicly deployed a text watermark for ChatGPT — it built one but has held it back. What ChatGPT output does carry is invisible characters (often from copy-paste or formatting) and formulaic “AI-tell” phrasing. Unmark strips the hidden characters, flags the clichés, and can rewrite the wording.

Paste AI text0 chars
Watermark-free text0 chars
Your watermark-free text appears here.
Strength
Humanise — natural rewrite, same length & meaning.
Paste AI text, then remove its watermark.
▸Hidden-character optionscore invisibles, tags & private-use are always removed

Does ChatGPT watermark its text?

Not in any confirmed, shipped way. OpenAI has researched a statistical text watermark but has not released it publicly, so there is no known SynthID-style mark in ChatGPT output today. Be sceptical of tools that claim to detect or remove a ChatGPT watermark — the reliable things to clean are invisible characters and tell-tale phrasing.

What to actually remove from ChatGPT text

Two things. First, invisible Unicode — zero-width spaces, joiners and byte-order marks that ride along in pasted text. Unmark detects and strips these in your browser. Second, formulaic AI cadence — phrases like “delve into”, “leverage” and “in today's fast-paced world”. Unmark flags them, and the rewrite reworks the wording so the text reads less like a template.

How to clean ChatGPT text

Paste the output below, then either strip the invisible characters instantly, or run a rewrite to also rework the wording. Copy the clean result. The readable text is preserved; only the hidden payload and the most formulaic phrasing change.

FAQ

Does ChatGPT add an invisible watermark to text?+
There is no confirmed, publicly deployed text watermark in ChatGPT. OpenAI has developed one internally but not released it. ChatGPT text can still contain invisible characters from formatting or copy-paste, which Unmark removes.
Can AI detectors tell if text came from ChatGPT?+
Not reliably. AI-text detectors have high error rates and frequently misflag human writing, so treat their verdicts with caution. Unmark doesn't claim to make text undetectable — it removes hidden characters and helps you edit out formulaic phrasing.
Is it free?+
Yes. The invisible-character scan runs in your browser and the rewrite is free to use.

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