2026年にプロのようにGPTZeroを使ってAIコンテンツを検出する方法

クイックスタート

This guide covers every GPTZero feature:

• はじめる — Create an account and run your first scan
• AI検出器の使い方 — Check any document and see whether it was written by AI
• AI用語の使い方 — Find the certain words that AI chatbot drafts repeat over and over
• How to Use Accurate Plagiarism Checker — Match your text against existing online sources in one scan
• How to Use Free Grammar Checker — Clean up grammar and sentence structure before you submit
• 幻覚検出器の使い方 — Catch fake sources and invented facts before anyone else does
• AIグレーダーの使い方 — Grade an essay against your own rubric in seconds
• 著者認証の使い方 — Prove your work was written by a human using your edit history
• 高度なAIスキャンの使い方 — See a plain English reason behind every flagged sentence
• Canvas連携機能の使い方 — Scan submitted assignments inside your existing classroom setup

所要時間： 各作品につき5分

このガイドには以下の内容も含まれています。 プロのヒント | よくある間違い | トラブルシューティング | 価格 | 代替案

このガイドを信頼する理由

I have used GPTZero for two years across 学生 essays and client drafts.

Every screen below comes from my own account, not a press kit.

GPTZero is the AI detector most 教師 and editors reach for first.

それはあなたの 文章 and tells you what looks written by AI.

Most people stop at that one score.

This guide shows you every tool behind it, step by step.

GPTZeroチュートリアル

This How to Use GPTZero tutorial walks through each feature in order, from your first scan to advanced grading.

GPTゼロ

Know in seconds whether a document was written by a human or an AI chatbot. GPTZero reads millions of documents worth of patterns and explains every flag it raises. Start free, no card needed.

今すぐGPTZEROをお試しください →

レビュー全文を読む →

GPTZeroの利用開始

Do this one time before you touch any feature.

約3分かかります。

ステップ1：アカウントを作成する

Go to the GPTZero landing page and click sign up.

メールアドレスを入力し、パスワードを作成してください。

✓ チェックポイント: チェックしてください 受信トレイ 確認メールについて。

ステップ2：ダッシュボードを開く

GPTZero runs in your browser, so there is nothing to install.

Log in and the dashboard opens with every tool in one menu.

Short videos in the help center cover each tool if you get stuck.

Here is what the main screen gives you:

✓ チェックポイント: You should see the scan box and the tool list.

Step 3: Add the Origin Extension

Install the GPTZero Origin extension for Chrome.

It adds live results in Google Docs and lets you scan any webpage.

GPTZero AI検出器の使い方

AI検出器 lets you scan a document and see how much of it reads as AI generated text.

以下に、その使用方法をステップごとに説明します。

ステップ1：テキストを貼り付ける

Open the GPTZero dashboard and create an account if you have not yet.

Paste your text into the scan box, or upload a PDF, DOCX or TXT file.

ステップ2：スキャンを実行する

Click the scan button and wait a few seconds.

これは以下のようなものです。

✓ チェックポイント: You should see a probability score plus sentence level highlighting.

Step 3: Read the Score

Probability scores show the likelihood of AI generation across the whole document.

Clean lines read as human writing, and flagged lines look written by AI.

GPTZero AI語彙の使い方

AI用語集 lets you spot the certain words that an AI chatbot leans on far too often.

以下に、その使用方法をステップごとに説明します。

Step 1: Open the AI Vocabulary Tool

Pick AI Vocabulary from the tool menu in your dashboard.

Step 2: Paste Your Draft

Drop in an エッセイ, a blog post or any text you want checked.

これは以下のようなものです。

✓ チェックポイント: Overused AI terms appear highlighted line by line.

Step 3: Rewrite the Flagged Words

Swap the flagged terms for your own 声 and normal word choice.

Your writing stops sounding predictable straight away.

How to Use GPTZero Accurate Plagiarism Checker

Accurate Plagiarism Checker lets you see whether your text matches pages that already exist online.

以下に、その使用方法をステップごとに説明します。

ステップ1：盗作チェッカーを開く

Select the plagiarism checker from the same dashboard menu.

Step 2: Add Your Document

Paste the text or upload the file you want compared.

これは以下のようなものです。

✓ チェックポイント: Matched passages appear with a link to the original page.

Step 3: Review Each Match

Open every flagged source and confirm the quote or citation is correct.

How to Use GPTZero Free Grammar Checker

Free Grammar Checker lets you fix grammar and sentence structure without leaving the editor.

以下に、その使用方法をステップごとに説明します。

ステップ1：文法チェッカーを開く

Choose the free grammar checker from your tool list.

Step 2: Paste the Text

Add the draft you want cleaned up.

これは以下のようなものです。

✓ チェックポイント: Errors appear inline with a suggested fix beside each one.

ステップ3：提案を適用する

Accept the fixes that help and skip the ones that flatten your voice.

GPTZero幻覚検出器の使い方

幻覚検出器 lets you catch invented facts and fake sources that an AI chatbot made up.

以下に、その使用方法をステップごとに説明します。

Step 1: Open the Hallucination Detector

Select the hallucination detector from the dashboard.

Step 2: Add Text With Citations

Paste any research summary, essay or report that cites sources.

これは以下のようなものです。

✓ チェックポイント: Suspect claims and broken references are marked in the results panel.

Step 3: Verify Every Flag

Open each flagged citation and confirm the source is real.

GPTZero AI Graderの使い方

AIグレーダー lets you grade an essay against your own rubric without reading it twice.

以下に、その使用方法をステップごとに説明します。

Step 1: Open the AI Grader

Pick the AI Grader and start a new grading job.

Step 2: Upload the Rubric

Upload rubric files and add a prompt describing what you want scored.

これは以下のようなものです。

✓ チェックポイント: A grade appears beside each rubric line with a short reason.

Step 3: Read the Feedback

You get a score plus written feedback you can edit before sending.

How to Use GPTZero Authorship Verification Tool

著者確認 lets you prove a document was written by a human using its edit history.

以下に、その使用方法をステップごとに説明します。

Step 1: Connect Google Docs

Install the GPTZero Origin extension and open your file in Google Docs.

Live results and flags appear as Google Docs comments beside your draft.

Step 2: Write as Normal

The extension records your writing process quietly in the background.

That typing pattern analysis becomes your evidence later.

これは以下のようなものです。

✓ チェックポイント: The GPTZero writing report opens as a video replay of your typing.

Step 3: Export the Writing Report

Share the human writing report as proof of how the draft grew.

How to Use GPTZero Advanced AI Scanner

高度なAIスキャン lets you see a plain English reason behind every single flagged sentence.

以下に、その使用方法をステップごとに説明します。

Step 1: Start an Advanced Scan

Toggle the advanced scan option before you run your check.

Step 2: Open a Flagged Sentence

Click any highlighted sentence to read why it was detected.

You see just what triggered the flag, not only a number.

これは以下のようなものです。

✓ チェックポイント: Each flag opens a short explanation written in normal language.

Step 3: Compare the Explanations

Look for repeated reasons across the document, not one odd line.

GPTZero Canvas連携機能の使い方

キャンバス統合 lets you scan submitted assignments without leaving your classroom software.

以下に、その使用方法をステップごとに説明します。

Step 1: Connect Canvas

Link your Canvas account from the integrations page in GPTZero.

Step 2: Pick a Course

Choose the course and the assignments you want covered.

これは以下のようなものです。

✓ チェックポイント: Your course 名簿 loads with a scan status beside each student.

Step 3: Review Submissions

Every submission gets scanned as it arrives, with results in one list.

GPTZeroのプロ向けヒントとショートカット

After two years of daily use, these are the habits that saved me the most time.

キーボードショートカット

ほとんどの人が見逃す隠れた機能

• バッチファイルアップロード: Drop a folder of assignments in at once instead of scanning one document at a time.
• Webpage scanning: The Origin extension will scan any page you are reading for AI generated content.
• API アクセス: Register on the Developer Portal, grab an API key and push large scan jobs through automatically.

GPTZeroでよくある間違いを避ける方法

Mistake #1: Trusting One Score

Mistake #2: Scanning Tiny Snippets

Mistake #3: Punishing Students on a Flag Alone

GPTZeroのトラブルシューティング

Problem: Your Own Essay Was Flagged

原因： Plain, tidy sentence structure looks predictable to any AI detector.

修理： Open your GPTZero writing report and share the video replay of your drafting.

Problem: The Same Text Gives Different Results

原因： Minor changes shift the score, and results can wobble on longer texts.

修理： Run the scan twice, then compare against a second detector before you decide.

Problem: A File Will Not Upload

原因： Only PDF, DOCX and TXT files are supported.

修理： Convert the file first. Text inside images is skipped, so paste that part manually.

📌 注記： If none of these help, contact GPTZero support.

GPTZeroとは何ですか?

GPTゼロ is an AI detector that tells you whether a document was written by a human.

Think of it as a smoke alarm for AI writing, not a courtroom verdict.

It compares your text against patterns learned from millions of documents.

Here is how GPTZero works when it separates human and AI text.

Two measures do most of the work: 困惑 and burstiness.

Perplexity basically measures how predictable your word choice is.

Burstiness looks at how much your sentence length varies across the page.

Human writing wanders. AI writing stays flat and even.

Unlike basic AI content detectors, it shows the reasoning behind each call.

That matters on real world drafts that mix both.

こちらの簡単な概要をご覧ください。

These are the key features you get:

• AI検出器： Paste text and get a probability score showing how much reads as AI generated
• AI用語集： Highlights the word choice patterns that make AI writing sound predictable
• Accurate Plagiarism Checker: A built in plagiarism checker that finds text matching existing online sources
• Free Grammar Checker: Free grammar feedback with suggestions that improve clarity and sentence structure
• 幻覚検出器： Flags invented claims and runs citation checks on the sources in your text
• AI採点者： Grades assignments against uploaded rubric files with custom feedback prompts
• 著者確認： Turns your writing process into a report that proves human authorship
• 高度なAIスキャン： Sentence level highlighting with natural language explanations for each flag
• Canvasとの連携： Connects to Canvas so teachers can scan assignments where they already grade

The company was built with education in mind and works with the American Federation of Teachers.

Research from 学校 such as Penn State still shows that detection accuracy varies between tools.

So no detector is the best solution on its own.

詳細なレビューについては、こちらをご覧ください。 GPTZeroのレビュー.

GPTZeroの価格

Here is what GPTZero costs in 2026:

無料トライアル: Yes, the free plan runs forever with a word limit per scan.

返金保証: Refunds are handled case by case through support.

💰 最もお得な価格: Premium — it unlocks batch uploads and longer scans for the price of two coffees.

GPTZeroと代替案の比較

How does GPTZero compare with the rest of the field?

おすすめ商品：

• 総合ベスト： GPTZero — it shows the reasoning behind every detected sentence.
• ベスト予算： Quetext — cheap plagiarism checking with AI detection attached.
• 初心者におすすめ： Grammarly — friendly feedback that fixes your writing as you type.
• 出版社にとって最適： Originality AI — team seats and scan history for content at scale.

🎯 GPTZeroの代替案

GPTZeroの代替サービスをお探しですか？おすすめの選択肢はこちらです。

• 🚀 クイルボット: Fast paraphrasing and a solid free AI detector in one place, ideal for writers polishing drafts before a final scan.
• 🏢 オリジナリティAI: Built for publishers and agencies. Strong on AI detection plus plagiarism, with team seats and a full scan history.
• 📊 ウィンストンAI： High accuracy claims and clean reporting. Popular with educators who want printable evidence for each document.
• 🧠 スモディン: A wide toolkit covering detection, rewriting and citations. Good value if you want more than one tool for the price.
• 💰 クエリテキスト: Budget friendly plagiarism checking with AI detection added. A simple pick for students on a tight budget.
• ⚡ 検出不可能: Runs several AI content detectors at once and shows every score, which helps you double check a borderline result.
• 🎯 Phrasly AI: Aimed at students who want feedback on AI phrasing before they submit an essay for grading.
• ⭐ 文法: Grammar, style and tone feedback with basic AI detection built in. The best solution if writing quality matters most.

全リストについては、こちらをご覧ください。 GPTZeroの代替案 ガイド。

⚔️ GPTZeroとの比較

Here is how GPTZero stacks up against each competitor:

• GPTZero vs QuillBot: GPTZero wins on detection depth. QuillBot wins if you mostly need rewriting and quick grammar help inside one editor.
• GPTZero vs オリジナリティAI： Originality AI suits agencies and publishers. GPTZero fits classroom use better thanks to its writing report and Canvas support.
• GPTZero対Winston AI： Both report high accuracy. GPTZero explains each flagged sentence, while Winston focuses on clean documents you can hand to a manager.
• GPTZero対Smodin： Smodin bundles more writing tools. GPTZero stays sharper at detecting AI and gives clearer reasons for every result.
• GPTZero vs Quetext: Quetext is cheaper and plagiarism first. GPTZero is the better choice when AI detection is the main job.
• GPTゼロと検出不可： Undetectable aggregates other detectors. GPTZero runs its own statistical analysis and shows you the reasoning behind it.
• GPTZero vs Phrasly AI: Phrasly AI targets students editing drafts. GPTZero serves both students and teachers with grading and verification tools.
• GPTZero vs Grammarly: Grammarly is a writing assistant first. GPTZero is a detector first, with far more detail on AI generated content.

今すぐGPTZeroを使い始めましょう

You now know how to use every major GPTZero tool:

• ✅ AI検出器
• ✅ AI用語集
• ✅ Accurate Plagiarism Checker
• ✅ Free Grammar Checker
• ✅ 幻覚検出器
• ✅ AIグレーダー
• ✅ 著作権確認
• ✅ 高度なAIスキャン
• ✅ キャンバス連携

次のステップ： pick one feature and try it today.

ほとんどの人はAI検出器から始めます。

5分もかかりません。

Used properly, it supports critical thinking instead of replacing it.

That habit protects you and your future assignments.

よくある質問

GPTZeroはどのように使用しますか？

Create an account, paste your text or upload a PDF, DOCX or TXT file, then run the scan. GPTZero returns a probability score with sentence level highlighting.

Can GPTZero detect チャットGPT?

Yes. GPTZero is trained to flag text from ChatGPT and other AI chatbot tools, including paraphrased output. It is accurate on longer texts but not perfect.

GPTZeroは無料で利用できますか？

Yes, the free plan costs $0 and covers basic scans. Premium is $12.99 and Professional is $24.99, which add batch uploads and higher word limits.

GPTZeroは私がAIを使用したと言っているのに、私は実際にはAIを使用していないのはなぜですか？

That is a false positive. Clean, predictable sentence structure can look AI generated. Share your Writing Report as proof the essay was written by a human.

GPTZeroのAI検出の精度はどの程度ですか？

Accuracy is high on longer texts and weaker on short snippets. Independent testing shows results vary, so double check every flag before acting on it.