Hidden character scan
See zero-width characters, controls, special spaces, and their exact Unicode code points.
Claude Watermark Detector
Check text for hidden Unicode, unusual spacing, and formatting artifacts. Understand what a Claude watermark checker can observe—and what it cannot prove.
Free to use · No sign-up · Text never leaves your device
0 / 100,000
Cleaned text
Your cleaned text will appear here after analysis. Only selected observable characters will be removed.
Ready for analysis
Analyze the original text to generate a cleaned copy.
A transparent text inspection tool
This detector separates observable text artifacts from claims that require a provider's private verification system.
Formatting analysis
Find repeated spaces, tabs, and line breaks that may have arrived during copying or conversion.
Reviewed cleanup
Preview a normalized copy while preserving language-sensitive characters unless you choose otherwise.
Important limitation
Hidden characters are not proof of Claude authorship
A statistical Claude watermark is woven into token choices at generation time. Checking that signal requires Anthropic's method and private key. A Unicode scanner cannot reproduce that verification.
This tool can inspect
Literal characters and formatting present in the text you paste, with exact positions and plain-language explanations.
This tool cannot verify
Whether Claude generated, edited, translated, or processed the text, or whether a private model-level watermark is present.
No-authority result
Use the report for technical inspection, not academic discipline, employment decisions, or claims about who wrote a document.
Inspect text in three steps
No account, upload, or external AI detector is involved.
- 01
Paste your text
Add text copied from Claude, a document editor, PDF, or web page.
- 02
Review visible evidence
See hidden Unicode, special spacing, formatting patterns, and exact locations.
- 03
Create a clean preview
Select only the characters you want excluded, then copy the reviewed result.
Claude watermark questions
Clear answers about detection, privacy, and the limits of public tools.