Unmark is a free web-based tool designed to remove digital watermarks from AI-generated text. As major AI providers increasingly watermark their outputs by default—such as Google's SynthID and Anthropic's Claude (to comply with the EU AI Act)—Unmark provides an easy way to strip these identifiers and restore clean text.

The tool tackles watermarking using a two-pronged approach. First, it instantly strips invisible Unicode characters (such as zero-width spaces, joiners, tag characters, and homoglyphs) directly within your browser. Second, it rewrites the wording of the text to actively disrupt statistical or SynthID-style watermarks. Unmark is completely free to use and operates entirely without requiring a login or account creation.

Pros of Unmark

Removes both invisible Unicode characters and statistical AI watermarks
Works instantly in your web browser
Completely free to use with no hidden fees
No registration, sign-up, or login required

Cons of Unmark

Disrupting statistical watermarks requires rewriting the text, which alters your original wording
Specifically targeted at SynthID and Claude watermarks, with no mention of support for other proprietary watermarking systems

Frequently Asked Questions

What types of AI watermarks does Unmark remove?

Unmark is designed to remove watermarks generated by Google's SynthID and Claude (implemented to comply with the EU AI Act).

How does Unmark strip watermarks from text?

Unmark uses two methods: it instantly strips invisible Unicode characters (like zero-width spaces, joiners, tag characters, and homoglyphs) directly in your browser, and it rewrites the text's wording to disrupt statistical, SynthID-style watermarks.