AIコンテンツ検出ツール
AI検出ツールは、文章がAIモデルによって生成された可能性と、人間によって書かれた可能性を推定します。本ツールを含め、完全に正確な検出ツールは存在しません。結果は確定的な証拠としてではなく、さらに検討すべきシグナルとして捉えてください。
Tezyarの研究コンサルタントが、明確さ、独自性、学術的トーンの観点から原稿を確認いたします。
使い方
- 1確認したい文章を貼り付けてください（数文以上を推奨）。
- 2「分析する」をクリックします。
- 3AI生成確率と人間による執筆確率の推定値、および簡単な説明を確認します。
こんな方におすすめ
- ✓特にAI支援の執筆ツールを使用した後、提出前に自分の草稿を確認する。
- ✓不自然に画一的、あるいは一般的な印象を受ける文章について、参考となる判断材料を得る。
- ✓共同執筆や外部委託の文章に自分の名前を記す前に確認する。
What Is an AI Content Detector?
An AI content detector is a model trained to spot statistical fingerprints that tend to separate machine-generated text from human writing. It doesn't "know" who wrote something the way a person would recognize a friend's voice. Instead, it looks at patterns like perplexity (how predictable each word choice is given the words before it) and burstiness (how much sentence length and structure vary across a passage). Human writing tends to be uneven — some short sentences, some long and messy ones, occasional odd word choices. Machine-generated text is often more uniform and statistically "smooth."
What this means practically: a detector can tell you how closely a piece of text resembles patterns typical of AI output, but it cannot see who actually typed the words, verify authorship, or read intent. It's a pattern-matching estimate, not a lie detector.
When Should You Use an AI Content Detector?
This tool is most useful as a quick sanity check rather than a verdict. A few realistic scenarios: if you used an AI assistant to help draft or edit part of your own paper, running it through the detector before submission can flag passages that still read as heavily machine-influenced, giving you a chance to revise them in your own voice. If you're reviewing writing — your own or someone else's — and notice it reads unusually uniform or oddly generic, the detector can give you a second data point to weigh alongside your own judgment.
It's also useful when reviewing collaborative or outsourced work, such as text from a co-author, research assistant, or freelance editor, where you simply want a signal on whether a section deserves a closer read. Treat the output as a starting point for further review, not as the final word.
AI Detection Accuracy and Its Limits
No AI detector, including this one, is perfectly reliable, and it's worth understanding why. False positives happen: heavily edited, polished, or non-native-English writing can sometimes resemble AI-generated patterns simply because it's cleaner and more evenly structured than typical first-draft prose. False negatives happen too: text that started as AI output but was substantially rewritten, restructured, or blended with human editing can lose the statistical signals detectors rely on and pass as human-written.
Length matters as well. Short passages give the model far less pattern data to work with, so confidence tends to drop noticeably on excerpts of just a sentence or two compared to full paragraphs or pages. None of this makes the tool useless — it just means a result should always be read as a probability estimate with real uncertainty attached, not as a fact.
Responsible Use in Academic Writing
The most responsible way to use a detector result is as a prompt for your own closer reading, not as proof of anything. If a score comes back higher than expected on your own writing, use it as a cue to revise the flagged sections in your own words rather than treating the number as a problem to fix. If you're evaluating someone else's work, a detector score alone is not sufficient grounds to accuse them of misconduct — it's a signal that may warrant a conversation, not a conclusion.
Academic integrity policies on AI use vary widely between institutions, departments, and even instructors, and they keep changing as norms evolve. Before relying on any detector result in a formal setting, check what your institution actually permits and how it expects AI-assistance concerns to be handled, since that policy — not a detector score — is the real standard you're accountable to.
よくある質問
本ツールを含め、100%正確なAI検出ツールは存在しません。私たちもそのような主張はいたしません。検出ツールはAIが書いた文章を見逃すこともあれば、特に短い文章や大幅に編集された文章について、人間の文章を誤ってAI生成と判定することもあります。
それを断定的な判定としてではなく、事実関係、自分らしい文体、適切な引用がなされているかをご自身で見直すきっかけとして捉えてください。
非常に短い文章では、検出ツールが意味のある推定を行うための十分な情報を得られません。そのため、短すぎる文章に対する結果は信頼性が低くなる傾向があります。