Claude Watermark Checker

Invisible Unicode inspector

Free Claude Watermark Remover and Checker

Paste text to see which invisible characters it carries, where each one sits, and what a clean copy looks like. Everything runs in this tab.

  • Text stays in your browser
  • No account required
  • File upload coming soon

Worked example

NothingU+200B about this sentence looks unusual to you,U+00A0or to a spell checkerU+2060.

3 of the 74 characters in that sentence do not render. Nothing about the text looks wrong, in this page or in any editor, because there is nothing to see. Their code points are marked in place above.

Check and clean Claude text

Analysis runs entirely in your browser. It checks for supported invisible Unicode and format-character carriers only (zero-width characters, directional marks, variation selectors, space homoglyphs, and similar). It cannot prove authorship, identify a specific tool, or detect every statistical (token-sampling) watermark.

0 characters

Cleaning settings

No analysis yet. Paste text and select "Analyze locally" to begin.

Method

How it works

  1. Paste your text

    Nothing is uploaded. The text stays inside your browser tab.

  2. Analyze locally

    Supported invisible Unicode characters and lookalike spaces are identified with their code points and exact positions.

  3. Review and clean

    Reveal the differences, then copy or download the cleaned text.

Detection

A transparent Claude watermark checker

The checker reveals supported invisible and lookalike Unicode characters that ordinary text editors can hide, including zero-width spaces, directional marks, variation selectors, and unusual space characters. Every finding includes its Unicode code point and position so you can review the evidence yourself.

Detection is not proof of authorship

Hidden Unicode can be inserted by many tools or appear for legitimate language and formatting reasons. A match does not prove that Claude wrote the text, and no match does not prove that it did not. This tool reports supported text markers rather than guessing who created the content.

Scope

Limitations

  • This tool cannot prove authorship of a piece of content.
  • There is no universal watermark or AI-content detector — only supported markers are checked.
  • File, image, and document inspection is not available in this first release.

Questions

Claude watermark checker FAQ

Is this an official Claude or Anthropic tool?

No. This is an independent utility and is not affiliated with or endorsed by Anthropic.

Does the checker upload my text?

No. Text analysis and cleaning run locally in your browser. There is no account or text-processing API.

What does the remover change?

It removes or normalizes only the supported characters selected in the cleaning settings and shows every change before you copy the result.

Can it detect every kind of watermark?

No. It cannot reliably identify every statistical, semantic, formatting, image, or proprietary watermarking method.