AI-powered writing assistant for grammar, style, and tone improvements across documents and emails.
Unmark
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About Unmark
Unmark is a browser-based tool that removes two types of AI watermarks from text: statistical watermarks like Google’s SynthID and hidden-character watermarks such as zero-width spaces and invisible Unicode. It rewrites text to disrupt statistical patterns while keeping the original meaning intact, and simultaneously strips invisible characters that may fingerprint the text. The tool works with output from any AI system, including ChatGPT, Claude, Gemini, and Copilot, and requires no account or setup. Users paste text, select a rewrite strength, and receive watermark-free text in three steps. Unmark operates entirely in the browser, ensuring privacy and speed, and offers options to normalize spaces, handle bidirectional text, and preserve emoji sequences. It is designed for users who need to remove AI watermarks for compliance, reuse, or privacy reasons.
Key features
- Rewrites text to break statistical watermarks
- Strips invisible Unicode characters
- Preserves emoji sequences
- Normalizes spaces and handles bidirectional text
- Three-step removal process
- Adjustable rewrite strength
- Instant browser-based scanning
- Free and private
Use cases
- Removing AI watermarks for reuse or redistribution
- Preparing text for human review without machine fingerprinting
- Complying with content policies that restrict AI-generated text
Pros
- Removes both statistical and hidden-character watermarks
- Operates entirely in-browser with no account required
- Preserves original meaning and emoji sequences
- Supports text from any AI system
- Free to use
Cons
- No API or batch processing
- Limited to text input only
- Rewrite strength affects output length
Frequently asked questions about Unmark
What is an AI text watermark?
An AI text watermark is a hidden signal embedded in AI-generated text to flag it as machine-generated. There are two types: statistical watermarks like Google’s SynthID, which bias word choices into a detectable pattern, and hidden-character watermarks, which use invisible Unicode characters such as zero-width spaces to fingerprint the text.
What is SynthID, and can Unmark remove it?
SynthID-Text is Google’s statistical watermark that nudges an AI model’s token choices into a measurable pattern. Unmark removes it by rewriting the text to scramble the pattern while preserving the original meaning, which is the only reliable way to strip a statistical watermark.
Does Claude watermark its text, and can Unmark remove it?
Anthropic has announced that future Claude models will watermark their text with a SynthID-style statistical method by default. Unmark can remove this watermark by performing a full rewrite of the text, ensuring the meaning remains intact.
How do I remove an AI watermark from text using Unmark?
Paste the AI-generated text into Unmark, select a rewrite strength, and click 'Remove watermark.' The tool rewrites the text to disrupt statistical watermarks and strips invisible characters simultaneously, then provides a clean output for copying.
Can Unmark make AI text permanently undetectable?
Rewriting text with Unmark substantially degrades statistical watermarks and AI-detector signals, especially with stronger settings. However, no tool can guarantee permanent undetectability against all future detectors, so the result should be reviewed carefully.
Which AI tools does Unmark work with?
Unmark works with any AI tool that generates plain text, including ChatGPT, Claude, Gemini, Copilot, and Llama. Since it operates on plain text, it can remove watermarks from output generated by any AI system.
