ChatGPT透かしを検出する方法：AI生成テキストの完全ガイド
ChatGPT透かしを検出するための包括的なガイド。複数の検出方法、技術の理解、無料ツールを使用してテキスト内の不可視AIマーカーを特定する方法を解説します。
はじめに
テキストがChatGPTで生成されたかどうかを判断できますか？文章スタイルやパターンを分析する以外にも、ほとんどの人が見逃している技術的な層があります：テキストに直接埋め込まれた不可視の透かしです。この包括的なガイドでは、シンプルなオンラインツールから高度な技術的アプローチまで、複数の方法を使用してChatGPT透かしを検出する方法を教えます。
学術提出物の確認、コードの不可視文字チェック、または単にAI透かし技術に興味がある場合でも、透かし検出に習熟するために必要なすべてを学べます。
ChatGPT透かしを理解する：何を探しているのか
検出方法に入る前に、何を見つけようとしているのかを正確に理解しましょう。
不可視文字の種類
ChatGPTやその他のAIモデルは、いくつかのタイプの不可視文字を埋め込むことができます：
1. ゼロ幅スペース（ZWSP）
- Unicode:
U+200B - 目的：単語間に不可視の区切りを作成
- 検出難易度：簡単
2. ゼロ幅非接合子（ZWNJ）
- Unicode:
U+200C - 目的：文字の合字を不可視に防止
- 検出難易度：簡単
3. ゼロ幅接合子（ZWJ）
- Unicode:
U+200D - 目的：目に見える効果なしに文字を結合
- 検出難易度：簡単
4. ソフトハイフン
- Unicode:
U+00AD - 目的：不可視に改行ポイントを提案
- 検出難易度：中程度
5. ワードジョイナー
- Unicode:
U+2060 - 目的：不可視に改行を防止
- 検出難易度：中程度
6. バイトオーダーマーク（BOM）
- Unicode:
U+FEFF - 目的：バイトオーダーを示す、時に透かしに悪用
- 検出難易度：難しい
これらの文字が透かしに最適な理由
AI企業がこれらの文字を選んだ理由：
- ほとんどのテキストエディタで完全に見えない
- テキストの外観や意味に影響しない
- コピー＆ペースト操作を生き残る
- 複数のプラットフォームで動作
- パターンや署名をエンコードできる
- 専門ツールなしでは気付きにくい
方法1：オンライン透かし検出ツール（最も簡単）
ChatGPT透かしを検出する最速の方法は、専門のオンライン検出ツールを使用することです。
GPT Watermark Removerの検出機能を使用
ステップ1： GPT Watermark Removerにアクセス
ステップ2： テキストを入力エリアに貼り付けまたは入力
ステップ3： 「透かしを検出」または「テキストを分析」をクリック
ステップ4： 検出レポートを確認：
- 検出された透かし総数: 検出された不可視文字の数
- 文字タイプ: どの特定のUnicode文字が存在するか
- 場所: テキスト内で透かしが現れる位置
- パターン分析: 透かしが認識可能なパターンに従っているか
- 視覚 的ハイライト: 不可視文字の位置をマーク
この方法が効果的な理由：
- 技術的な知識不要
- 即座の結果（1〜2秒）
- 視覚化を含む詳細な分析
- 100%プライバシー（ブラウザベース処理）
- あらゆるテキスト長に対応
- ドキュメントアップロードに対応（Word、Pages）
- 無料で無制限に使用可能
検出結果の解釈
例のレポート：
透かし検出: 47個の不可視文字
内訳:
- ゼロ幅スペース (U+200B): 23個
- ゼロ幅非接合子 (U+200C): 15個
- ゼロ幅接合子 (U+200D): 9個
パターン分析: 規則的な分布パターンを検出
可能性: AI透かしの可能性が高い
推奨: 使用前に透かしを削除
これが示すこと：
- 高いカウント（>20）: 意図的な透かしの可能性
- 複数のタイプ: 洗練された透かしスキーム
- 規則的パターン: 体系的なAI埋め込み
- ランダム分布: 偶発的な挿入の可能性
方法2：ブラウザ開発者ツール（インストール不要）
基本的な技術ツールに慣れている方には、ブラウザの開発者ツールが強力な検出機能を提供します。
Chrome/Edgeの開発者ツール方法
ステップ1： ブラウザの開発者ツールを開く
- Windows/Linux:
F12またはCtrl+Shift+Iを押す - Mac:
Cmd+Option+Iを押す
ステップ2： コンソールタブに移動
ステップ3： テキストを変数に貼り付け：
const text = `ここにChatGPTテキストを貼り付け`;
ステップ4： 検出コードを実行：
// 包括的な透かし検出
function detectWatermarks(text) {
// 異なる透かしタイプのパターンを定義
const patterns = {
'ゼロ幅スペース': /\u200B/g,
'ゼロ幅非接合子': /\u200C/g,
'ゼロ幅接合子': /\u200D/g,
'ソフトハイフン': /\u00AD/g,
'ワードジョイナー': /\u2060/g,
'バイトオーダーマーク': /\uFEFF/g
};
const results = {};
let totalCount = 0;
// 各タイプをスキャン
for (const [name, pattern] of Object.entries(patterns)) {
const matches = text.match(pattern);
const count = matches ? matches.length : 0;
if (count > 0) {
results[name] = count;
totalCount += count;
}
}
// 結果を出力
console.log(`%c 検出された透かし総数: ${totalCount}`, 'color: red; font-weight: bold; font-size: 16px');
if (totalCount > 0) {
console.log('%c 内訳:', 'color: blue; font-weight: bold');
for (const [type, count] of Object.entries(results)) {
console.log(` ${type}: ${count}個`);
}
} else {
console.log('%c 透かしは検出されませんでした！', 'color: green; font-weight: bold');
}
return { totalCount, results };
}
// 検出を実行
detectWatermarks(text);
ステップ5： 詳細な検出結果を示すコンソール出力を確認
方法3：テキストエディタでの検出方法
異なるテキストエディタは、不可視文字を検出するための様々な方法を提供します。
Microsoft Word検出
方法A：フォーマット記号を表示
- Wordでドキュメントを開く
- 「ホーム」タブをクリック
- 「段落」グループで¶（編集記号の表示/非表示）ボタンをクリック
- 単語間の異常なドット、マーク、スペースを探す
方法B：検索と置換での検索
Ctrl+H（Windows）またはCmd+H（Mac）を押す- 「詳細オプション>>」をクリックしてオプションを展開
- 「ワイルドカードを使用」にチェック
- 「検索する文字列」に入力：
^u200B - 「次を検索」をクリックして透かしを見つける
方法C：文字数分析
- すべてのテキストを選択（
Ctrl+A/Cmd+A） - 「校閲」>「文字カウント」を確認
- 「文字数（スペースを含む）」をメモ
- テキストをプレーンテキストエディタ（メモ帳）にコピー
- 再度文字数を確認
- 数値が大きく異なる場合、不可視文字が存在
VS Code / テキストエディタでの検出
VS Code方法：
- コマンドパレットを開く（
Ctrl+Shift+P/Cmd+Shift+P） - 「View: Toggle Render Whitespace」と入力
- 不可視文字が色付きのドットとして表示される
- 検索と置換を使用（
Ctrl+H/Cmd+H） - 正規表現モードを有効にする（
.*アイコン） - 検索：
[\u200B-\u200D\uFEFF\u00AD\u2060] - エディタでハイライトされたマッチを確認
方法4：コマンドライン検出ツール
開発者やパワーユーザー向けに、コマンドラインツールは自動化とバッチ処理を提供します。
Python検出スクリプト
包括的な検出ツールを作成：
#!/usr/bin/env python3
"""
ChatGPT透かし検出器
テキストファイルの不可視AI透かしをスキャン
"""
import re
import sys
from pathlib import Path
from collections import Counter
# 透かし文字を定義
WATERMARKS = {
'\u200B': 'ゼロ幅スペース',
'\u200C': 'ゼロ幅非接合子',
'\u200D': 'ゼロ幅接合子',
'\u00AD': 'ソフトハイフン',
'\u2060': 'ワードジョイナー',
'\uFEFF': 'バイトオーダーマーク'
}
def detect_watermarks(text):
"""テキスト内の透かしを検出して分析"""
pattern = '|'.join(re.escape(char) for char in WATERMARKS.keys())
matches = re.finditer(pattern, text)
positions = []
types = []
for match in matches:
char = match.group()
positions.append(match.start())
types.append(WATERMARKS[char])
return positions, types
def detect_file(filepath):
"""ファイル内の透かしを検出"""
try:
with open(filepath, 'r', encoding='utf-8') as f:
text = f.read()
positions, types = detect_watermarks(text)
print(f"\n{'='*60}")
print(f"ファイル: {filepath}")
print(f"{'='*60}")
if not positions:
print("✓ 透かしは検出されませんでした")
return
print(f"⚠ 検出された透かし総数: {len(positions)}")
print(f"\n内訳:")
type_counts = Counter(types)
for watermark_type, count in type_counts.items():
print(f" - {watermark_type}: {count}個")
except Exception as e:
print(f"エラー: {filepath}: {e}")
if __name__ == "__main__":
if len(sys.argv) < 2:
print("使用方法: python detect_watermarks.py <ファイル1> [ファイル2] ...")
sys.exit(1)
for filepath in sys.argv[1:]:
path = Path(filepath)
if path.is_file():
detect_file(path)
else:
print(f"エラー: {filepath} が見つかりません")
使用方法：
# 単一ファイルを検出
python detect_watermarks.py document.txt
# 複数ファイルを検出
python detect_watermarks.py *.md
方法5：ドキュメント固有の検出
異なるドキュメント形式には、専門的な検出アプローチが必要です。
Word文書（.docx）
オプション1：組み込みツールを使用
- Wordで開く
- ファイル > 情報 > 問題のチェック > ドキュメントの検査
- 「非表示のテキスト」と「非表示のコンテンツ」の結果を確認
オプション2：オンライン検出器を使用
- GPT Watermark Removerにアクセス
- .docxファイルをアップロード
- 詳細な検出レポートを表示
- 必要に応じてクリーンバージョンをダウンロード
PDF文書
PDFは透かしが以下に存在する可能性があるため、扱いが難しいです：
- テキストレイヤー
- 隠れたメタデータ
- 埋め込みフォント
検出方法：
- PDFからテキストをコピー
- 透かし検出器に貼り付け
- 結果を分析
- 検出された場合、テキストを抽出してPDFを再生成
方法6：自動化されたCI/CD検出
透かし検出を開発ワークフローに統合します。
Gitプリコミットフック
透かしのあるコードがコミットされるのを防止：
#!/bin/bash
# .git/hooks/pre-commit
# ステージングされたファイルの透かしを検出
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New feature ideasImprovement suggestionsUser experience feedbackGeneral feedbackShare NowEvery idea counts - together we make this tool even better!Help & SupportFrequently Asked Questions
Find answers to the most common questions about our AI watermark remover.
AI watermarks are invisible characters (like zero-width spaces) that AI tools like ChatGPT insert into generated text. These hidden markers help identify AI-generated content but don't affect readability.
Our tool scans your text for invisible characters commonly used as AI watermarks, such as zero-width spaces and ASCII control characters. It then highlights these markers and can remove them completely while preserving your original content.
No. All text processing happens directly in your browser. We don't store, log, or transmit your text anywhere. Your privacy is our priority.
We detect various invisible characters including zero-width spaces, zero-width joiners, soft hyphens, word joiners, and ASCII control characters that AI tools might use as watermarks.
No. The tool only removes invisible characters used as watermarks. Your visible text, formatting, and meaning remain exactly the same.
Yes, the free version currently has a 500-character limit per operation. Signed-in users get 1,500 characters. This helps ensure fast processing and optimal performance.
Yes! You can upload Word (.docx) documents directly to our tool. We'll scan and remove invisible watermark characters from all sections including main content, headers, footers, footnotes, and comments—all while preserving your document's formatting and layout. Processing happens entirely in your browser, so your documents remain private.
Yes! You can upload Apple Pages (.pages) documents directly to our tool. We support both modern and legacy Pages formats. We'll scan and remove invisible watermark characters from your entire document while preserving all formatting, styles, and layout. All processing happens locally in your browser, ensuring your documents stay completely private.
Your documents are 100% secure and never leave your device. All document processing happens entirely in your browser using JavaScript. When you upload a Word or Pages document, it's read and modified locally on your computer—we never send your files to any server. This means your sensitive documents, personal information, and private content remain completely confidential. Even we can't see what you're processing. This client-side approach ensures maximum privacy and security for your documents.
If you clean a document using our document uploader and then copy-paste the text into the text detection area, you might see watermarks detected. This is normal and doesn't mean the cleaning failed. Here's why: Document cleaning preserves all formatting (bold, italics, spacing, etc.) to keep your document looking identical. When you copy this formatted text, some harmless formatting characters (like special spaces or unicode formatting marks) come along. Our text detection tool, which is designed to be more aggressive, might flag these formatting characters as potential watermarks. The document itself is clean—these are just formatting artifacts from the copy-paste process, not actual AI watermarks. For best results, use the cleaned document directly rather than copy-pasting its content.
Zero-width characters are invisible Unicode characters that take up no visual space but exist in the text data. AI systems like ChatGPT insert these as digital watermarks to help identify AI-generated content. Common types include zero-width spaces (U+200B), zero-width joiners (U+200D), and zero-width non-joiners (U+200C). Our tool detects and removes these invisible markers.
Our AI watermark remover is completely free, processes text locally in your browser for maximum privacy, and supports ChatGPT, Claude, Gemini, and other major AI models. Unlike other tools, we never store your text, offer document cleaning for Word and Pages files, and have no character limits for signed-in users.
Yes! Simply copy text from ChatGPT, Claude, Gemini, or any AI chat and paste it directly into our tool. Our invisible character detector will instantly identify any hidden watermarks, and you can clean the text with one click. This clean paste workflow is designed to be fast and seamless.
Paste your text into our detector tool. We'll scan for over 40 types of invisible Unicode characters commonly used as AI watermarks, including zero-width spaces, zero-width joiners, and other hidden markers. Detected watermarks are highlighted so you can see exactly where they are in your text.
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Professional AI text detection and cleaning
EditPreview500 / 5005/5 scansInstall Chrome ExtensionDashes (— – ‒ ―)60-second cooldown between scans
Sign in for enhanced features
Clean Word Documents (.docx)
Remove AI watermarks from Word files while preserving all formatting
Drop your Word document here
or click to browse files
Only .docx files • Max 50MB
All processing happens locally in your browser. Your document never leaves your device.
Clean Apple Pages Documents (.pages)
Remove AI watermarks from Pages files while preserving all formatting
Drop your Pages document here
or click to browse files
Only .pages files • Max 50MB
All processing happens locally in your browser. Your document never leaves your device.
Fully Private
All processing happens in your browser
Preserves Formatting
Your document stays visually identical
Instant Processing
Cleaned in seconds
New!Remove Gemini Image Watermarks for free
Clean AI-generated images from Google Gemini. Remove visible watermarks and strip EXIF metadata including GPS location - 100% free and private.
Remove visible watermarksStrip all metadata100% privateClean Images Now Before & AfterWhy Remove AI Watermarks?
Here's why you should remove invisible AI watermarks:
With Watermarks
Text Detection
AI detection tools flag your content
Readability
Hidden characters may cause formatting issues
Copy/Paste
Invisible markers transfer between apps
Privacy
Text contains trackable markers
After Removal
Text Detection
Pass AI detection checks confidently
Readability
Clean, properly formatted text
Copy/Paste
Text copies exactly as intended
Privacy
No hidden tracking elements
Ready for clean text?Specialized Solutions for Every AI Model
Tailored guides and tools for ChatGPT, Gemini, Claude, and more.
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New feature ideasImprovement suggestionsUser experience feedbackGeneral feedbackShare NowEvery idea counts - together we make this tool even better!Help & SupportFrequently Asked Questions
Find answers to the most common questions about our AI watermark remover.
AI watermarks are invisible characters (like zero-width spaces) that AI tools like ChatGPT insert into generated text. These hidden markers help identify AI-generated content but don't affect readability.
Our tool scans your text for invisible characters commonly used as AI watermarks, such as zero-width spaces and ASCII control characters. It then highlights these markers and can remove them completely while preserving your original content.
No. All text processing happens directly in your browser. We don't store, log, or transmit your text anywhere. Your privacy is our priority.
We detect various invisible characters including zero-width spaces, zero-width joiners, soft hyphens, word joiners, and ASCII control characters that AI tools might use as watermarks.
No. The tool only removes invisible characters used as watermarks. Your visible text, formatting, and meaning remain exactly the same.
Yes, the free version currently has a 500-character limit per operation. Signed-in users get 1,500 characters. This helps ensure fast processing and optimal performance.
Yes! You can upload Word (.docx) documents directly to our tool. We'll scan and remove invisible watermark characters from all sections including main content, headers, footers, footnotes, and comments—all while preserving your document's formatting and layout. Processing happens entirely in your browser, so your documents remain private.
Yes! You can upload Apple Pages (.pages) documents directly to our tool. We support both modern and legacy Pages formats. We'll scan and remove invisible watermark characters from your entire document while preserving all formatting, styles, and layout. All processing happens locally in your browser, ensuring your documents stay completely private.
Your documents are 100% secure and never leave your device. All document processing happens entirely in your browser using JavaScript. When you upload a Word or Pages document, it's read and modified locally on your computer—we never send your files to any server. This means your sensitive documents, personal information, and private content remain completely confidential. Even we can't see what you're processing. This client-side approach ensures maximum privacy and security for your documents.
If you clean a document using our document uploader and then copy-paste the text into the text detection area, you might see watermarks detected. This is normal and doesn't mean the cleaning failed. Here's why: Document cleaning preserves all formatting (bold, italics, spacing, etc.) to keep your document looking identical. When you copy this formatted text, some harmless formatting characters (like special spaces or unicode formatting marks) come along. Our text detection tool, which is designed to be more aggressive, might flag these formatting characters as potential watermarks. The document itself is clean—these are just formatting artifacts from the copy-paste process, not actual AI watermarks. For best results, use the cleaned document directly rather than copy-pasting its content.
Zero-width characters are invisible Unicode characters that take up no visual space but exist in the text data. AI systems like ChatGPT insert these as digital watermarks to help identify AI-generated content. Common types include zero-width spaces (U+200B), zero-width joiners (U+200D), and zero-width non-joiners (U+200C). Our tool detects and removes these invisible markers.
Our AI watermark remover is completely free, processes text locally in your browser for maximum privacy, and supports ChatGPT, Claude, Gemini, and other major AI models. Unlike other tools, we never store your text, offer document cleaning for Word and Pages files, and have no character limits for signed-in users.
Yes! Simply copy text from ChatGPT, Claude, Gemini, or any AI chat and paste it directly into our tool. Our invisible character detector will instantly identify any hidden watermarks, and you can clean the text with one click. This clean paste workflow is designed to be fast and seamless.
Paste your text into our detector tool. We'll scan for over 40 types of invisible Unicode characters commonly used as AI watermarks, including zero-width spaces, zero-width joiners, and other hidden markers. Detected watermarks are highlighted so you can see exactly where they are in your text.
More Questions?
Try our tool and discover for yourself how easy it is!
実行可能にする：
chmod +x .git/hooks/pre-commit
検出結果の理解
何が「透かし」としてカウントされるか？
明確な指標：
- 複数のゼロ幅文字（>10）
- 規則的な分布パターン
- 複数の段落にわたる存在
- 混合文字タイプ（ZWSP + ZWNJ + ZWJ）
偶発的な可能性：
- 非常に少ない文字（<5）
- ランダムで散発的な配置
- 単一の文字タイプのみ
- 特定のセクションのみ（コードブロック、引用）
推奨アクション閾値
| カウント | 評価 | 推奨 |
|---|---|---|
| 0-2 | クリーン | アクション不要 |
| 3-10 | 疑わしい | コンテキストを調査 |
| 11-50 | 透かしの可能性が高い | 削除を検討 |
| 51+ | 確実に透かしあり | 即座に削除 |
定期検出のベストプラクティス
開発者向け
- リンターを設定して不可視文字をキャッチ：
// .eslintrc
{
"rules": {
"no-irregular-whitespace": "error"
}
}
-
プリコミットフックを実行（CI/CDセクション参照）
-
コードレビュープロセスに検出を統合
-
不可視文字をハイライトするIDEプラグインを使用
コンテンツクリエイター向け
- AI支援コンテンツを公開前にチェック
- 編集ワークフローの一部として検出ツールを使用
- AI使用を透明に文書化
- 最終エクスポート前に体系的にクリーン
教育者向け
- 採点前に学生の提出物をスキャン
- 透かしと検出について教育
- AI使用と開示に関する明確なポリシーを確立
- 検出を罰則ではなく教育の機会として使用
まとめ
ChatGPT透かしの検出は、AI生成コンテンツの時代における必須スキルです。シンプルなオンラインツール、ブラウザの開発者ツール、コマンドラインスクリプト、または自動化されたCI/CDワークフローを使用する場合でも、テキスト内の不可視マーカーを識別する複数の方法があります。
重要なポイント：
- 異なる使用ケースに対応する複数の検出方法が存在
- GPT Watermark Removerのようなオンラインツールが最も簡単な検出を提供
- 透かしタイプを理解することで結果を解釈できる
- 自動化と統合でワークフロー効率を向上
- 検出は定期的なコンテンツ/コードレビューの一部であるべき
今すぐ透かしを検出 - 無料ツール
テキストに隠れたAI透かしがないか確認する準備はできましたか？
機能：
- 数秒で即座に検出
- 視覚化を含む詳細な分析
- パターン認識と分布分析
- 100%プライバシー（ブラウザベース）
- ドキュメントに対応（Word、Pages）
- 無制限で無料使用
- ワンクリックで透かしを削除
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