Book Formatting Software for Mac & Windows
Format Your Manuscript into a Beautiful Book in Minutes
Book formatting software for Mac and Windows. Start formatting in minutes.
Real Authors. Real Results.
Hear from authors who use Lacuna to create professionally formatted print books and eBooks.
I originally checked out Lacuna because somebody in a KDP publishing group I belong to asked if anyone had tried Lacuna out yet. I published nine other books using a different formatter, but I wasn’t happy with it. I ended up taking a look at Lacuna even though I was pretty much sold on Atticus or Vellum. Once I started diving into Lacuna and saw the ease of use and flexibility, I was absolutely floored. It was a no-brainer, and I purchased Lacuna. Since then the program has only improved. Corey is amazing at fixing things and streamlining processes.
If you take a look at the book that I formatted with Lacuna you will see, it would be pretty difficult to do something like that with one of those other formatting programs. Plus they cost more. In my opinion Lacuna is already the best formatter on the market and only getting better. Thanks, Corey and Melissa, for making this available.
3-Minute Wrestling Devotionals for Rising Athletes
NextGen Victory Press
The software is amazing! Lacuna literally saved my book launch. It’s so easy to use, even for a non-tech person like me. The team is incredibly kind and responsive. They added features based on my needs and fixed my issues in less than a day. I could go on and on praising this formatting software. My book looks so beautiful, both the EPUB and print PDF versions. They also keep adding new, stunning features with smooth updates. It’s honestly the best investment I’ve made so far in my author journey.
Winning My Ex-Crush
Syanna Rose
I tried numerous formatting methods and followed endless instructions from publishing websites, but nothing ever turned out right. Since finding Lacuna, everything has changed. I’ve been able to update all my manuscripts effortlessly and give them the professional look they deserve.
Lacuna helped me perfect one of my most cherished stories, The Magic Globe, and finally present it exactly as I envisioned. It’s truly been a game changer for my author journey.
The Magic Globe
Samuel Graham Astley
I can honestly say the Lacuna Book Formatter has everything I need to control my eBook. I started my publishing journey with prior knowledge of building websites with HTML and working for Barnes&Noble when the first Nook was introduced. I learned all I could to get my ebook on every device in my store, fueling my need to add more flare for my readers.
The Lacuna Book Formatter has all the features I learned to code, plus a heavy dosage of new features I never thought of, all presented in an easy-to-use program that takes the guesswork out of creating ebooks that people want to read. Trust is important when designing a unique experience for my readers of the Thicket Trilogy, and Lacuna is part of that family.
City of Thicket (The Thicket Trilogy)
A T Veatch
Book Formatting Software That Puts Authors First
Lacuna is more than just another book formatting app. We stay current with the latest publishing requirements and handle the technical details (such as image compression) so you can publish with total confidence.
Download for Mac or Windows →Runs entirely on your computer. No cloud, no syncing, no AI training, no data mining. Your work always stays private and local.
No more white screen of death. No more lost work from browser crashes. No more syncing errors or workarounds. Just a reliable desktop app that works.
Professional EPUBs and print-ready PDFs that pass validation for all major distributors. A built-in checklist ensures you never forget a critical step.
We help you publish with confidence. Your paperbacks, hardcovers, and eBooks will work with all major distributors.
From Manuscript to Marketplace in 3 Simple Steps
Minimal learning curve. No technical knowledge required. Just your manuscript and 10 minutes.
Drag & Drop Your Manuscript
Import your manuscript as a .docx file (Microsoft Word, Google Docs, LibreOffice, etc.). Watch as Lacuna instantly recognizes chapters, sections, and special elements. Minimal setup required.
Design & Preview in Real Time
Choose from professional premade styles or customize your own ebook design. See exactly how your book looks on Kindle, iPhone, and other devices as you work.
Export with Confidence
One click generates a perfect EPUB or print-ready PDF that passes validation on every platform. Upload directly to Amazon KDP, IngramSpark, Apple Books, Kobo, Barnes & Noble, and more.
Ready to transform your manuscript?
Download the book formatting app that authors love
Format Your Book NowHere’s How Lacuna Makes It Easier For You
We didn’t just build another book formatting app. We reimagined the entire workflow from an author’s perspective.
The Old Way
- ✗Manually format each chapter
- ✗Fix broken styles one by one
- ✗Export, find issues, start over
- ✗Lose formatting between versions
The Lacuna Way
- Import once, format everywhere
- Global styles update instantly
- Live preview catches issues before export
- Your formatting is always preserved
Your book deserves better than a glorified word processor
Every hour you spend fighting with formatting is an hour you’re not spending on your next chapter.
Hours Lost to Manual Formatting
Let’s say you decide to change one chapter’s font. Now you’re hunting through 30 different sections, praying you don’t miss one. Every small design choice spirals into hours of tedious, manual work, forcing you to be a technician instead of a storyteller.
The Fear of a Bad First Impression
You’ve invested in a stunning cover; don’t let your interior formatting break your promise to your reader. Inconsistent spacing and amateur typography can make them question the quality of your craft before they’ve read a single word.
The Unreliability of the Cloud
Cloud formatters promise convenience but deliver anxiety. The constant worry your work didn’t sync, the inability to work on a plane or in a hotel, the fear of losing everything to a server glitch. Your manuscript is too important to be trusted with such a fragile system. Lacuna is different—our desktop formatting software saves your work safely on your computer, fast and reliably.
Why Desktop-Native Changes Everything
We built Lacuna as desktop author software for a reason. Here’s what that means for your writing career.
Meet the Team
We’re a brother and sister duo who decided to build this application together. She’s been writing books for 20 years. He’s been writing software for 25 years. Together, we’re building something really special.
Melissa Erin Jackson
Author & Creative Director
“I’ve been writing for over 20 years and I’ve published 15 books since 2018. I know what authors need because I’m one, too. I’ve paid formatters and I’ve attempted to format manually. Formatting software was a game changer. The process is pain-free and fun for me now. I want to help every author who has ever called formatting a nightmare.”
- •10 years of publishing experience
- •Multi-genre author
- •Understands the author struggle
Corey Jackson
Software Architect & Developer
“I’ve been hacking software together since I was 10 years old. Since I can remember it’s been the main thing I’ve ever wanted to do. When my sister told me about her formatting struggles, I knew we could build something better. With many long nights and a lot of energy drinks 🫠, we’ve built something really amazing. The best part about it all is we’re doing it together.”
- •25 years of software development
- •Full-stack architecture expertise
- •Passionate about solving real problems
Why We’re Building This Together
Family. Experience. Passion.
We’re combining her decade of publishing experience with his quarter-century of software expertise. As siblings, we’re not just business partners — we’re building something we’re both really proud of, for authors who deserve better tools.
You’re 60 Seconds Away from Never Fighting with Formatting Again
Join other authors who’ve reclaimed their writing time.
After you download:
100% Safe & Secure
How it works: Use the app as much as you want until you're ready to export, then pay $139 one time. After that, you can use the app as much as you want. No subscriptions. No hidden fees. Updates included forever.
Still hesitating?
Every day you wait is another day wrestling with formatting instead of writing. There’s literally no risk — download now and see the difference immediately.
Frequently Asked Questions
Can’t find what you’re looking for? Contact our customer support team