Free purpose-built tool
Claude Watermark Checker
Inspect Claude text for hidden Unicode, zero-width characters, tags, variation selectors, and unusual spaces without claiming authorship proof.
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Your result
Your result will appear here.
HOW TO USE
From a useful brief to a usable result
- 1Enter the source, audience, and constraints requested by the form.
- 2Complete the Cloudflare security challenge and generate.
- 3Review facts, copy the result, or adjust inputs for another version.
WHEN TO USE IT
Built for this specific task
- Inspect copied Claude output before publication
- Separate risky controls from legitimate script characters
- Document exact Unicode code points for debugging
EXAMPLE
Input
A visually ordinary Claude response containing a word joiner, an Arabic letter mark, and an emoji variation selector.
Output preview
A categorized Unicode audit that separates suspicious controls from context-dependent script or emoji characters and lists exact positions.
KNOW BEFORE YOU GENERATE
Limits and review checklist
- A Unicode scan cannot authenticate Claude authorship
- Some invisible characters are legitimate in Arabic, Persian, Indic scripts, mathematics, and emoji
COMMON QUESTIONS
Frequently asked questions
Does a hidden character mean Claude wrote the text?
No. Editors, websites, documents, and any text generator can introduce the same character.
What happens when nothing is found?
The result says no selected literal artifacts were detected; it does not certify that the text is human-written.