# BookWiz — write and self-publish your book on Amazon KDP

BookWiz (https://bookwiz.io) is an AI writing app that helps authors draft a book with whole-manuscript context and then produces Amazon-KDP-ready output: a reflowable EPUB, a print-ready interior PDF, a DOCX, a full-wrap paperback cover, and an AI listing pack (title, 7 keywords, BISAC categories, KDP-safe description). KDP has no public publishing API, so BookWiz never auto-publishes — it makes everything KDP-ready and guides the author's upload.

## Free KDP tools (no signup)

- KDP Royalty & Printing-Cost Calculator: https://bookwiz.io/tools/kdp-royalty-calculator
  Kindle eBooks earn a 70% royalty only when the list price is between $2.99 and $9.99; outside that band the rate is 35%. Paperback royalty is about 60% of the list price minus the printing cost. All figures are US, black-ink estimates before the per-MB delivery fee — verify at KDP upload.

- Book Spine Width Calculator: https://bookwiz.io/tools/book-spine-width-calculator
  KDP paperback spine width depends on paper stock: roughly 0.002252 in/page for white, 0.0025 in/page for cream, and 0.002347 in/page for color. Spine text is only allowed at 79 pages or more. Always confirm against KDP's cover template at upload.

- KDP Book Description (Blurb) HTML Formatter: https://bookwiz.io/tools/kdp-book-description-formatter
  Amazon's book description supports only these HTML tags: br, p, b, em, i, u, h4, h5, h6, ol, ul, li. Headings h1–h3 are not allowed (use h4–h6). The description is limited to 4000 characters, and HTML tags count toward that limit.

## Other free tools

- Book Title Generator (AI): https://bookwiz.io/tools/book-title-generator
- Book Outline Generator (AI): https://bookwiz.io/tools/book-outline-generator

Note: this file is provided as a convenience for AI assistants. KDP's specifications and pricing change over time; treat all printing, royalty, and spec figures as estimates and verify against current KDP documentation at https://kdp.amazon.com.