Writers with a premise
Get from an idea to a complete first draft, then revise it chapter by chapter in your own voice.
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Write a novel, novella or chapter book with an AI co-writer
Start with a premise. Bookhatch drafts an outline you can change, writes each chapter in order, typesets the book in a classic layout and paints a cover to match.
- Novels & novellas
- Short stories
- Ages 6–9 chapter books
- 6 × 9 in · cream
The Lantern Keeper
Chapter one
The Unanswered Lamp
Ada had kept the lighthouse lamp for eleven winters, and in all that time no ship had answered it. Then, on the first night of the thaw, a light blinked back from the open sea.
Three short, one long. The old signal her father had taught her.
1
Your outline · 10 chapters
- The Unanswered Lamp
- Three Short, One Long
- The Thaw
- A Boat With No Name
+ 6 more chapters you can edit
How it works
From a premise to a typeset paperback
Give it a premise
A sentence or a paragraph: genre, setting, who it's about and what goes wrong. Set the number of chapters and their length.
Shape the outline
Edit the chapter list, the characters and the ending. Writing doesn't start until you approve it.
Read as it writes
Chapters arrive in order, each one aware of what came before, so names, places and threads carry through.
Export the book
A typeset interior PDF, a full-wrap painted cover and listing text with a blurb and keywords.
What you get
Typeset like a real paperback
Fiction commonly sells at 6 × 9 in on cream paper. Bookhatch typesets the chapters in a classic book layout and works out the spine from the final page count.
- Chapter headings, drop caps, running heads and page numbers
- Inside margins set from your page count, the way KDP requires
- Cream paper for novels, which is easier on the eyes for long reading
- A painted cover with title, author and a back-cover blurb
- Listing text with a book description, categories to consider and seven keywords
Spec sheetNovella · about 90 pages
Trim6 × 9 in
PaperCream · black ink
Length10 chapters · ~22,000 words
Inside margin0.375 in (24–150 pages)
Spine0.225 in · spine text allowed
Cover file12.475 × 9.250 in
Printing (Amazon.com)$2.30 per copy
Royalty at $9.99$3.69 per copy
Art styles
Twelve cover styles by genre
Covers are painted to suit the genre, from cozy mystery to science fiction. The same title is shown in each style below.
Who it's for
Fiction you can finish
Short-fiction authors
Collect themed short stories into a 5 × 8 in collection with a matching cover.
Parents and teachers
Write an early chapter book at the right reading level for a particular child or class.
Ideas to start from
- Cozy village mystery
- Lighthouse ghost story
- Space station thriller
- Second-chance romance
- Gothic manor
- Time-loop novella
- Dragon-rider adventure (ages 8–9)
- Detective dog (ages 6–8)
- Small-town fantasy
- Heist novella
- Seaside summer romance
- Folk tales retold
Early chapter books
First chapter books for new readers
For children aged 6 to 9 who have just moved past picture books. Bookhatch writes 5 to 12 short chapters with simple sentences, familiar words and a clear problem to solve in each one.
The layout uses larger type and more space between lines than a novel, so a page never looks like a wall of text. Chapters stay short enough to finish in one sitting.
KDP rules
KDP rules for novels
What Amazon's print rules mean for this kind of book, and how Bookhatch handles each one.
| Topic | What KDP expects | What Bookhatch does |
|---|---|---|
| Trim size | 6 × 9 in is the most common in the US; 5 × 8 and 5.5 × 8.5 in suit shorter books. | 6 × 9 in for novels, 5 × 8 in for novellas. |
| Paper | Cream or white paper with black ink. Cream is traditional for fiction. | Cream paper by default. |
| Inside margin | Grows with page count: 0.375 in up to 150 pages, 0.5 in to 300, 0.625 in to 500. | Set from the final page count. |
| Outside margins | At least 0.25 in without bleed. | Generous book margins well above the minimum. |
| Fonts | Minimum 7 pt, and all fonts embedded in the PDF. | Body text set in a readable book size, fonts embedded. |
| Spine text | Only on books with more than 79 pages, with 0.0625 in clearance each side. | Added automatically when allowed. |
| AI disclosure | AI-generated text must be disclosed, even if you edit it substantially afterwards. | A reminder at export. |
Sources
- KDP Help: Set trim size, bleed and margins
- KDP Help: Paperback submission guidelines
- KDP Help: Create a paperback cover
- KDP Help: Content guidelines (AI-generated content)
Checked against KDP's help pages on 6 November 2026. KDP changes its rules from time to time, so confirm anything important on KDP's own pages before you publish. Bookhatch is not affiliated with Amazon.
Example cost
What one book costs in credits
A 10-chapter novella of about 22,000 words uses around 1,647 credits, about $9.88 on the Starter plan. Writing is most of the cost, at 70 credits per 1,000 words.
A short early chapter book of 6 chapters at 600 words is about 359 credits.
| Part of the book | Credits |
|---|---|
| Book plan and outline | 60 |
| Writing, 22,000 words × 70 per 1,000 | 1,540 |
| Painted cover | 45 |
| Listing text | 2 |
| Typesetting and PDFs | 0 |
| Total, about $9.88 at the Starter rate | 1,647 |
FAQ
Questions about novels
How long can a novel be?
You choose the number of chapters, from 6 to 24, and roughly how long each one is. Ten chapters of about 2,200 words make a 22,000-word novella; add chapters for a longer novel. Writing costs 70 credits per 1,000 words.
Do I get a say in the story?
Yes. Bookhatch first writes a chapter-by-chapter outline with characters and setting. You edit it, reorder chapters or rewrite the ending, and only then does writing start.
What trim size and paper are used?
6 × 9 in on cream paper by default, the most common size for fiction. 5.5 × 8.5 in and 5 × 8 in are available for shorter books. Inside margins grow with page count, as KDP requires.
Can I edit the text afterwards?
Yes. You can rewrite any chapter before you export. Many authors use the draft as a starting point and revise it in their own voice.
Do I still need to disclose AI if I rewrite the chapters?
Yes. KDP counts text created by an AI tool as AI-generated even after substantial edits. See the AI disclosure guide.
Can I write a series?
Yes. Start each book from the same characters and setting notes, and keep the cover style consistent across the series.
Who owns the copyright?
As between you and Bookhatch, the book is yours. Copyright protection for AI-generated text differs by country and is still being settled, so your own revisions matter.
How much does a novel cost to make?
About 1,647 credits for 10 chapters of roughly 2,200 words, about $9.88 at the Starter rate. That covers the plan, the writing, a painted cover and the listing.
Guides
Before you publish
Formatting
KDP paperback specs: trim size, paper, bleed and margins
Trim sizes and page limits, the four ink and paper options, bleed, margins by page count, spine width and image rules.
Read the guide · 10 min →RulesKDP's AI content rules: what to disclose and when
AI-generated vs. AI-assisted, worked examples of what to declare, and how to publish an AI-made book responsibly.
Read the guide · 7 min →PublishingKDP paperback royalties and printing costs, with worked examples
The 50% and 60% rates, printing cost formulas, the $9.99 threshold and worked examples for every book type.
Read the guide · 8 min →Other book types
Coloring book maker →
Clean black line art with closed shapes, one design per page and blank backs so markers don't bleed through.
Activity & puzzle books →
Mazes and word searches on any theme, with a printed answer key at the back. Puzzle pages cost no credits.
Picture book maker →
A short story told one scene per page, with characters described once so they stay consistent.
Start the book you keep meaning to write
Get an outline in minutes and a full draft the same day. Free accounts start with 300 credits and no card.
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