AI Text Watermark Scanner

Inspect and clean literal hidden text artifacts without rewriting the visible words.

Open the demonstration GIF directly

A dependency-free, local-first JavaScript scanner for literal hidden Unicode and removable formatting artifacts. It reports exact code points and locations, creates a conservative cleaned copy, and makes no authorship claim.

Why this exists

Copied AI text can contain zero-width characters, directional controls, unusual spaces, or formatting artifacts. A generative rewrite can change meaning. This package takes the deterministic route: identify the exact character, show its location, and remove only supported literal artifacts.

It is intentionally separate from statistical model watermark detection. Provider-level signals require an official supported verifier.

What you get

• Exact Unicode code points and source locations
• Conservative cleaning with readable wording preserved
• Dependency-free JavaScript and TypeScript types
• CLI output for local files
• SARIF 2.1.0 export for CI and GitHub Code Scanning
• Public fixtures shared with the hosted scanner and browser tools
• No text upload, telemetry, or authorship accusation

Install

npm install ai-text-watermark-scanner

JavaScript

import { scanText } from "ai-text-watermark-scanner";

const result = scanText("copied text");
console.log(result.findings);
console.log(result.cleanedText);

CLI

ai-watermark-scan draft.txt

Export SARIF 2.1.0 for GitHub Code Scanning or another CI system:

ai-watermark-scan draft.txt --sarif > ai-text-watermark-results.sarif

SARIF output includes deterministic artifact findings, exact code points, severity, and source locations. It does not claim AI authorship or official model-level watermark detection.

Example result

{
  "findings": [
    {
      "codePoint": "U+200B",
      "name": "ZERO WIDTH SPACE",
      "index": 6,
      "removable": true
    }
  ],
  "cleanedText": "Clean text"
}

Use it in CI

ai-watermark-scan content.txt --sarif > results.sarif

Upload results.sarif to GitHub Code Scanning or another SARIF-compatible system. Findings remain deterministic and reviewable.

Integration examples

• Node.js
• Hosted scan API
• GitHub Actions and SARIF

Choosing the right tool

Need	Use
Exact hidden-character evidence	This package
Lossless literal artifact cleaning	This package
Browser copy workflow	Browser extension
File and batch reports	Hosted product
Official provider watermark conclusion	A connected provider verifier
Stylistic rewriting or humanization	A rewriting tool, with semantic review

The package does not detect or claim to remove statistical model-level watermarks such as deployed provider token-sampling signals. Use AI Text Watermark Remover for the hosted scanner, reports, batch workflows, browser tools, and current provider guidance.

Public verification

• Literal artifact coverage benchmark
• Downloadable Unicode fixtures
• Browser answer-selection compatibility
• Downloadable provider fixtures
• Hosted and self-hosted API documentation
• Provider capability API
• Provider adapter conformance contract

The hosted product and self-hosted API use the same deterministic literal-artifact rules as this package. Provider-specific model-watermark verification remains separate and is reported only when an official supported verifier is available.