A Paris Developer's Open Source Tool Already Strips Anthropic's New Claude Watermark - Startup Fortune

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A Paris Developer's Open Source Tool Already Strips Anthropic's New Claude Watermark

Anthropic began invisibly watermarking all Claude-generated text on August 2, 2026 to comply with the EU AI Act, only for Paris developer Guillaume Meyer to release a free tool that strips it days later. The open-source "watermarks-remover" has passed 14,000 GitHub stars, and Anthropic still hasn't published a detector to verify whether it actually works.

Elroy Fernandes

Aug 23, 2026 · 8:52 AM ·<br>5 min read<br>1.3K reads

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Anthropic's Claude watermark has already created the market every watermark creates: tools promising to remove it. The uncomfortable part is that nobody outside Anthropic can yet prove which claims work.

If you've searched for a Claude watermark remover this month, you're not wandering into a niche argument. You're walking straight into the weak spot in AI transparency rules. Anthropic says Claude models launched in the EU on or after August 2, 2026 will carry machine-readable marks from launch, and that the system applies worldwide where supported. Within days, a public GitHub project from Guillaume Meyer was being treated as the first obvious workaround.

The timing is not random. Article 50 of the EU AI Act started applying on August 2, 2026, and the European Commission says breaches can bring fines of up to 15 million euros or 3% of worldwide annual turnover. Existing systems get a limited grace period for the marking requirement until December 2, 2026, but new models are expected to support marking at launch. That's why Anthropic moved.

The mark itself doesn't look like anything. There's no banner, no tag and no visible symbol sitting at the top of the page. Anthropic's own help page says generated text will carry embedded watermarks, while supported generated files will include signed provenance metadata. Its technical post also makes one point that matters here: nothing is added to the text, and there are no hidden characters. The text watermark lives in word choice.

That distinction is everything.

A Free Tool Now Strips AI Watermarks From Claude, OpenAI and Gemini Text<br>A free, MIT-licensed tool called watermarks-remover now strips AI provenance watermarks from Claude, OpenAI, and Gemini output across text, images, and documents. It arrived days after Anthropic began watermarking all Claude text globally to comply with the EU AI Act, raising doubts about whether provenance watermarking can actually be enforced. - remove AI watermarks from text - how to strip Claude watermarks easily

The GitHub answer came fast

Meyer's project, watermarks-remover, is public on GitHub under an MIT license. His GitHub profile describes him as founder of Memo, an AI tool for e-commerce brands, and creator of the remover project. Three jobs, in effect. The repository cleans odd Unicode characters, strips file metadata such as C2PA and EXIF, and uses rewrite hooks for statistical text watermarks tied to Claude, Gemini, OpenAI provenance surfaces and open model schemes.

Business Insider reported that Meyer is a Paris-based tech entrepreneur. The first version, it said, took about five hours to build. It also reported the number that made the project hard to ignore: more than 14,000 GitHub stars. BleepingComputer had counted more than 4,500 stars days earlier. That is how quickly this moved.

Meyer has framed the argument carefully. 'I am all for content attribution,' he told Business Insider. 'I am against the watermarking technique, and that's a very significant distinction.' He also told the outlet that watermarking treats authorship as binary, even when Claude has only edited, translated or cleaned up a paragraph that began with a human.

You don't have to agree with him to see the problem. Anthropic itself says a detected mark is a signal that Claude was involved, not proof that Claude wrote the underlying idea. If you write a memo yourself and ask Claude to fix the grammar, the final version can still be marked. A detector may be technically right and practically misleading at the same time.

The claim is ahead of the proof

Here is where the remover story gets thinner. BleepingComputer found that the easy parts are real: hidden...