Creating a project: type, details and trim size

The three-step new-book wizard, trim sizes, hardcover rules and Quick Start.

Last reviewed 2026-09-28

Starting a book is a three-step wizard: "Book Type", "Details", then "Confirm". Nothing is charged until you begin Phase 1 inside the project.

Step 1 — Book Type

Choose the type that matches the finished product. Each card shows an estimated credit range for a typical book of that type.

Step 2 — Details

  • Title and author (pen) name — you can change both later.
  • Genre or niche and target audience — this steers the plan and the writing.
  • Trim size and formats (paperback, hardcover, ebook where available).
  • A short book description — the more specific, the better the plan.

Trim size and hardcover

Trim size is the finished page size. 6" × 9" is the most versatile for prose; 8.5" × 11" suits coloring books, workbooks and planners; square sizes suit picture books.

Hardcover (case laminate) is available at these trim sizes: 5.5" × 8.5", 6" × 9", 6.14" × 9.21", 6.69" × 9.61", 7" × 10", 8.25" × 11".

Hardcover at another size
If you selected a trim size that Amazon KDP does not offer in hardcover, the Confirm step shows a hint with the closest hardcover-capable size. You can also switch in the Design phase trim picker.
Changing trim later
Changing trim size after your interior or covers are built means those files must be rebuilt, and rebuilding costs credits. The Design phase shows a "Rebuild needed" warning when this applies.

Quick Start

Quick Start pre-fills a proven brief for a book type so you can see the flow end to end. In Phase 1 you are asked whether to research the example brief (costs credits) or use your own idea for free — choose "Use my own idea" if you already know what you want to write.

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