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Check a book manuscript for AI writing

Yes. Check a book manuscript with Winston AI chapter by chapter: a full-length book is longer than one scan allows, and per-chapter results show where AI-like writing clusters. Upload a .docx or paste each chapter to get a human score and sentence highlights. If you self-publish on Amazon KDP, remember that AI-generated text must be disclosed there.

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Key facts

  • AI detection uses one credit per word, so a 70,000-word manuscript uses about 70,000 credits.

    Source: Pricing

  • All plans accept .docx uploads; PDF and TXT uploads are on paid plans.

    Source: Pricing

  • Plagiarism checks on Advanced and Team plans compare text with web pages and can leave out quotations.

    Source: Plagiarism Checker

What changes when you check books and manuscripts

  • A book is longer than one scan

    Full-length manuscripts run past the word limit of a single scan, so check them chapter by chapter. Per-scan limits are listed on our pricing page.

  • AI use is often uneven

    A writer might use a tool for a summary chapter, back-cover copy or filler scenes and write the rest themselves. Chapter-level results show where to look.

  • Genre conventions read predictable

    Familiar beats in romance and thrillers, or step-by-step structure in how-to nonfiction, can read as formulaic whoever wrote them.

  • Dialogue gives less signal

    Pages of short dialogue lines carry less prose for a detector to judge than narrative paragraphs. Weigh dialogue-heavy chapters with care.

How to check books and manuscripts

  1. Step 1: Split the manuscript by chapter

    Save each chapter as its own .docx, or paste chapters one at a time. Leave out front matter, acknowledgments and the author bio.

  2. Step 2: Scan each chapter into one folder

    Keep the manuscript's scans together so you can compare chapters side by side.

  3. Step 3: Compare chapter scores

    Most chapters of a book written by one person score in a similar range. Look closely at chapters that stand out.

  4. Step 4: Read the highlights in the outliers

    Open the chapters that differ and read which sentences are highlighted before drawing conclusions.

  5. Step 5: Check for copied passages

    On Advanced and Team plans, run a plagiarism check to find text that matches web pages.

  6. Step 6: Share the report with the author

    On paid plans, a PDF report or share link lets an editor and author discuss the same highlights.

Rules that apply

What the organizations behind books and manuscripts say about AI, checked . Policies change, so confirm with the source before you rely on one.

  • Amazon KDP: AI-generated content must be disclosed

    KDP's content guidelines require authors to tell Amazon about AI-generated content (text, images or translations) when they publish a new book or republish an edited one. Content created by an AI-based tool counts as AI-generated even after substantial edits. AI-assisted content, where you created it and used AI to edit, refine or error-check it, doesn't need to be disclosed.

    Source: kdp.amazon.com (opens in a new tab)

A book is too long to judge from a single score. Winston AI lets publishers, editors, agents and self-publishing authors check a manuscript chapter by chapter and see which sentences read as machine-written. This page covers how to scan a long manuscript and what Amazon KDP's content guidelines ask authors to disclose.

For publishers, editors and agents

A chapter-by-chapter check gives you a map of a manuscript before you invest in it. Use it to decide what to ask the author about, then read their answer and their drafts. Our page for editors covers a fuller review workflow.

For self-publishing authors

If you used AI to generate any text, images or translations, KDP asks you to disclose it at publishing. If you only used tools to edit or error-check writing you created, KDP calls that AI-assisted and doesn't require disclosure. Checking your own chapters helps you answer that question accurately.

Questions about checking books and manuscripts

Still unsure? Browse our guides or ask our team.

Can you check a whole book for AI?

Yes, chapter by chapter. A full-length book is longer than one scan allows, and per-chapter results are more useful than one number for the whole manuscript.

How many credits does a novel use?

AI detection uses one credit per word, so a 70,000-word novel uses about 70,000 credits. A plagiarism check costs extra.

Do I have to tell Amazon KDP if I used AI?

If AI generated text, images or translations in your book, KDP's content guidelines require you to disclose it. If you only used AI to edit, refine or error-check your own writing, KDP calls that AI-assisted and doesn't require disclosure.

What file types can I upload?

All plans accept .docx uploads. PDF and TXT uploads are on paid plans, and you can always paste text.

Is a flagged chapter proof that AI wrote it?

No. A score is evidence to review alongside drafts and the author's explanation, not proof.

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Paste the text to see which sentences read as machine-written. Sign up free when you want to keep your reports.

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