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Wellset Books Print & ebook formatting

Frequently asked questions

eBook Conversion

What’s the difference between EPUB and Kindle?
Less than there used to be. EPUB is the open industry standard, and Amazon now accepts and recommends it for Kindle as well, so one well-built EPUB works across Kindle, Apple Books, Kobo, Google Play, B&N, and Draft2Digital. We deliver EPUB as standard, and can also provide a Kindle-specific KPF on request.
What happened to .mobi?
Amazon stopped accepting .mobi for new KDP uploads as of March 18, 2025. They now want EPUB or KPF. We still produce .mobi on request if you have an older workflow or need to keep a sideloaded copy for old Kindle e-readers, but it isn’t the recommended default anymore.
Will my ebook look the same on every device?
Not pixel for pixel, and that’s by design. A standard ebook is reflowable, which means the reader can set their own font, size, and spacing, and the file adapts to each screen. What we control is that it’s clean everywhere: proper structure, a working table of contents, and links that work, so it reads well however the reader sets things up. The exception is fixed-layout, where the page is locked in place like a PDF. That’s what we use for children’s picture books and other heavily illustrated titles, where the text needs to stay exactly where it sits on the art.
Do you do fixed-layout ebooks?
Yes, for illustrated and children’s books. See the children’s book page for details.
Can you convert from a print PDF?
Yes, as long as it’s an un-scanned PDF (exported from Word or InDesign, not OCR’d from a printed book). A clean PDF or a Word document both work fine, so whichever is easier for you.
Do I need an ISBN for my ebook?
Usually not for Kindle. Amazon assigns its own identifier, an ASIN, automatically when you upload, so a Kindle ebook doesn’t require you to buy an ISBN. You’d only need your own ISBN if you plan to sell the ebook through other stores, or you want one ISBN that you own across your print and ebook editions. If you supply one, we’ll place it on the copyright page. It’s worth knowing that print and ebook count as separate editions, so each takes its own ISBN.

Children’s Book Formatting

I don’t have illustrations yet. Do you make them?
No. We typeset around the illustrations you’ve commissioned. We’re happy to recommend illustrators if you need one.
Can you do the print + Kindle Kids version together?
Yes. We can produce the print interior and a fixed-layout Kindle Kids edition together, so you launch in both formats at once.
Do you handle the cover?
No, we focus on the interior. Cover design is a separate craft, and we’re happy to recommend a trusted specialist if you need one.

Custom Book Interior Design

How is this different from the standard print package?
The print package is for standard novels and straightforward non-fiction, where the layout follows familiar conventions even though every book is set up individually. This service is for books that need a custom design (sidebars, image grids, recipe layouts, and the like), where those conventions don’t fit and the layout is built from the ground up.
Do you do indexes?
Yes, but indexing is quoted separately because it depends heavily on book length and complexity.
What’s the timeline?
Custom interiors take longer, up to 4 weeks from manuscript handoff to final files, depending on the book. If you need it sooner, ask when you reach out and we’ll let you know what’s possible.
Can you match an existing book’s look?
Yes, and we encourage it. Send a reference book whose interior you love and we’ll build a similar typographic system, calibrated to your own manuscript.

Still have a question?

Send us a short note and we’ll get back to you with answers, or book a free 15-minute intro call and ask us directly.