Is this an official Claude or Anthropic tool?
No. This is an independent utility and is not affiliated with or endorsed by Anthropic.
Free · Private · Browser-based
Free Claude Watermark Remover and Checker
Paste text from Claude or another source to reveal supported hidden Unicode markers, see their exact positions, and create a cleaned copy. Your text never leaves your browser.
Text stays in your browserNo account requiredFile upload coming soon
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
No analysis yet. Paste text and select "Analyze locally" to begin.
File inspection is on the way.
This first release handles pasted text entirely in your browser. Uploads are disabled for now, so no file can be selected or sent.
Planned support includes inspecting document and image metadata and downloading a cleaned copy where the format is supported.
What it checks
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.
What it means
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.
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.
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.
Claude watermark checker FAQ
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.