Write Your Book, Then Actually Publish It -- The Right Way for Wherever You're Submitting
Book Writing Toolbox is a real chapter editor with a publishing platform picker -- KDP, IngramSpark, B&N Press, Lulu, and more -- that gets your trim size, margins, and ISBN right per platform.
Here's a problem that has nothing to do with the writing itself: you finish a manuscript, then hit a wall of platform-specific rules nobody warns you about. KDP wants one trim size, IngramSpark wants a different margin entirely and won't give you a free ISBN, Barnes & Noble Press won't accept a custom trim size at all. Format for the wrong one and you find out only when a submission gets rejected.
Book Writing Toolbox is built around that problem directly, not around ignoring it.
A Real Chapter Editor, Not a File Assembler
Write directly in a real rich-text editor -- bold, italic, underline, headings, lists, tables, images with alt text, scene breaks -- with instant, free, unlimited preview that shows the exact, professionally typeset page layout you'd actually get. No estimate, no approximation.
Pick Your Platform, and the Tool Adjusts for Real
A picker at the top lets you choose Amazon KDP, IngramSpark, Barnes & Noble Press, Lulu, or an ebook-only platform like Draft2Digital, Apple Books, or Kobo Writing Life -- each individually checked against that platform's own real requirements, not KDP's rules relabeled.
- Trim sizes filter to what that platform actually supports -- Barnes & Noble Press won't even offer Custom, since it genuinely doesn't accept sizes outside its own fixed list.
- The real margin math changes with it -- KDP's gutter scales with page count, IngramSpark and Lulu use a flat margin, Barnes & Noble Press has its own different inside margin.
- ISBN guidance updates to match -- KDP, B&N Press, and Lulu each offer a free, platform-exclusive ISBN; IngramSpark doesn't, and says so plainly.
- Picking an ebook-only platform switches on Ebook only mode automatically, hiding the print-only sections instead of leaving them there unused.
Free and unlimited Pre-flight Check runs a real render and a real EPUB build to check trim size, page count, margin, ISBN, and cover resolution against whichever platform you've picked -- so a problem shows up before you spend a download credit finding it, not after.
Beyond the Retail Book: Manuscript, ONIX, EPUB
A real Shunn Standard Manuscript Format export (.docx and .pdf) covers what a literary agent or publisher actually expects -- 12pt Times New Roman, double-spaced, a real running head, an honest word count. Real ONIX metadata export covers what retailers and distributors actually read. And EPUB is always free and unlimited, real EPUB 3 with EPUB Accessibility 1.1 / WCAG AA conformance whenever every image genuinely has alt text -- never a download credit, even for the clean copy.
Work on More Than One Book
My Books keeps as many projects going as you want on the same device, autosaved locally, switchable in one click without losing progress on any of them.