A Manuscript Is Not a Book Yet.
Most self-published authors finish their manuscript in a Word document or Google Doc, then hit a wall. KDP and IngramSpark expect precise trim sizes, bleed, and margins. Ebook stores expect a properly formatted EPUB. None of that comes standard from a word processor built for essays, not novels.
A great manuscript in a badly formatted book still reads like an amateur put it together. Readers notice inconsistent margins, orphaned headings, and a cover that looks like a template nobody customized.
Hiring a professional book designer costs hundreds of dollars per project. Dedicated formatting apps like Vellum are Mac-only, so Windows authors are locked out entirely. WriteO's Book Designer gives every author, on any platform, the same interior styling, cover design, and print-ready export tools, built into the app they are already writing in.
Every Page Styled Like a Real Book.
Typography, drop caps, and trim sizes built for print, not a document that merely looks like one.
Click to expand · Book Design
Typography & Interior Themes
Choose from ten curated interior themes or fully customize your body font, line height, and paragraph spacing. Upload your own font or pick from WriteO's built-in library.
Drop Caps & Scene Breaks
Add a styled drop cap to your opening paragraphs and choose from rule, symbol, or blank scene break styles, with per-break overrides when you need them.
Front, Back Matter & Custom Pages
Add a title page, dedication, acknowledgments, and other front and back matter, or insert your own custom pages anywhere between chapters.
From Cover to Print-Ready PDF.
A full cover designer and a print-ready PDF export built for KDP and IngramSpark.
Cover Designer & Spine Calculator
Design a front, back, and full-wrap cover with text, shape, and gradient layers. WriteO's spine calculator sizes your spine automatically based on page count and trim size for KDP and IngramSpark.
Print-Ready PDF Export
Export a print-ready PDF with a built-in preflight check for margins, bleed, and image resolution before you send your file to print.
EPUB & DOCX Export
Export your manuscript's text, headings, and scene breaks to a reflowable EPUB for ebook stores, or to DOCX for agent and publisher submissions.
Image Placement & Crop Tool
Drag, resize, and rotate images anywhere on a page, with a built-in crop tool and multi-line captions. Images stay anchored to their paragraph, so they never drift when you edit earlier chapters.
Book Design Software That Understands Self-Publishing.
A spreadsheet cannot format a book, and a word processor was never built to either. Self-published authors need trim sizes, bleed, drop caps, and a cover that meets KDP's exact spine width, not a document that merely looks like a book when you squint.
WriteO gives every author that toolset built into the same app they already write in. Write and format a book in one app, on Windows, Mac, or anywhere your browser runs.
No Vellum. No Mac requirement. No separate formatter to hire.
Word Processor or a Mac-Only App
- Manuscript stuck in a Word document with no real book layout
- Formatting apps like Vellum are Mac-only, locking out Windows authors
- Hiring a professional book designer for every new release
- A cover built in a generic template with no accurate spine width
- Switching between a writing app and a separate formatting app
WriteO Book Designer
- Full interior typography, drop caps, and trim size control built in
- Works in any browser on Windows, Mac, or Chromebook
- A complete cover designer with an automatic spine width calculator
- Print-ready PDF, plus EPUB and DOCX export, from the same design
- Write and format your novel in one app, start to finish
Frequently Asked Questions
What is book design software?
Book design software lets you lay out a manuscript's interior typography and cover without hiring a formatter or designer. WriteO's Book Designer handles trim size, margins, typography, drop caps, and a full cover designer, all inside your existing novel.
Can I export a print-ready PDF for KDP?
Yes. WriteO's book design tool exports a print-ready PDF with KDP-accurate trim sizes, bleed, and margins, plus a preflight check before you export, so your file is ready for Amazon KDP or IngramSpark.
Does WriteO export to EPUB?
Yes. WriteO's epub export tool converts your manuscript into a reflowable EPUB with your text formatting, headings, and scene breaks intact, ready for Kindle and other ebook stores. Cover art and interior images are a print PDF feature and are not included in the EPUB file.
Can I design my book cover in WriteO?
Yes. WriteO's book cover designer includes front, back, and full-wrap layouts with an automatic spine width calculator, template starting points, and text, shape, and gradient layers, so your cover is ready to pair with your print-ready PDF.
Can I preview my book design before exporting?
Yes. WriteO's book design software shows a live preview of your interior layout and cover as you work, so you can see exactly how your printed book will look before you export a file.
What is book trim size and how do I choose one?
Trim size is the finished page size of your printed book, such as 5.5 by 8.5 inches or 6 by 9 inches for most novels. WriteO's book design software includes standard book trim size presets for KDP and IngramSpark, plus custom sizing and margin control.