Last reviewed by Robert Prime — June 2026
Quick Answer: No — KDP does not require you to have different odd and even page numbers, and it doesn't mandate any specific page-numbering scheme at all. Your interior PDF can number pages however you like, or omit visible numbers completely. KDP only checks that the file is correctly sized for your trim, within the page-count limits, and not corrupted — not which side a page number sits on. The thing people should alternate by odd and even page is the gutter margin, so text isn't swallowed by the spine. That's a margin setting, not a numbering rule.
Full breakdown below — including the three different things people lump under "odd/even".
Page numbers vs margins vs page count at a glance
| Thing | Does it alternate by odd/even? | Is it a KDP requirement? |
|---|---|---|
| Page numbers (folios) | Position mirrors on a spread (convention only) | No — KDP mandates no numbering scheme |
| Margins / gutter | Yes — inside margin must swap sides | Effectively yes — gutter must clear the spine |
| Chapter starts (recto) | New chapters start on right-hand pages (convention) | No — convention for a pro look |
| Total page count (parity) | Final count can be odd or even | No parity rule — only min/max per trim |
Searching this as "KDP page numbering rules" instead? Same answer: there isn't a numbering rule. The rule that bites people is the margin one.
Why people think odd and even page numbers are "required"
This question almost always comes from mixing up three separate things that all happen to alternate between left and right pages in a finished book. Untangle them and the confusion disappears:
- Page numbers (folios) — the actual digits printed on the page.
- Margins (the gutter) — the white space around the text, especially the inner margin near the spine.
- Recto starts — the convention that chapters begin on a right-hand page.
Only one of those — the margin — is something you genuinely must get right for KDP. The other two are typesetting conventions that make a book look professional but are not enforced at upload. Let's take them in order of how much they actually matter.
The thing that DOES matter: mirrored margins and the gutter
In a printed paperback, the page numbering style stays the same throughout — what changes is which side the inner margin sits on. On a right-hand page (the "recto", which carries the odd numbers), the binding is on the left. On a left-hand page (the "verso", carrying the even numbers), the binding is on the right. So the inside margin — the gutter — swaps sides every page.
This is the real "alternates by odd and even" requirement, and it has nothing to do with the page numbers themselves. If you set a single uniform margin all the way round, half your pages will have text running too close to the spine, where it disappears into the binding. On a thick book that's not just ugly — it can make lines genuinely hard to read.
The fix is mirrored margins (sometimes called inside/outside margins). You set an inside margin and an outside margin, and the typesetting software automatically flips them depending on whether the page is left or right. KDP's gutter allowance scales with page count: a slim 100-page book needs only a small inner margin, while a 600-page block needs noticeably more inside margin to clear the deeper spine. The thicker the book, the more the spine "eats", so the bigger the gutter has to be. Always check the current gutter table for your page count on KDP's own help pages before you finalise — verify the current figure on KDP's site.
The convention people copy: recto chapter starts
Open most professionally typeset books and you'll notice new chapters tend to begin on a right-hand page — the recto, an odd-numbered page. Front-matter sections (title page, dedication, contents) usually do the same. Where the previous chapter ends on a right-hand page, the typesetter inserts a blank left-hand page so the next chapter still lands on the right.
This is a polish convention, not a KDP rule. Amazon will happily accept a book where chapters start on either side. But recto starts are part of what makes a book feel "properly made", so if you're aiming for a traditional look it's worth doing. The trade-off: those inserted blank pages add to your total page count, which feeds into both your printing cost and your spine width.
A separate issue entirely: odd total page count
Here's where it gets genuinely muddled. There's a different KDP issue people hit and then describe as an "odd page" problem — but they mean the total page count, not the page numbers. Your final book can have an odd or an even total page count; parity on its own is generally fine. KDP doesn't reject a file for having an odd number of pages.
What KDP does enforce is minimum and maximum page counts per trim size and ink type. Go under the minimum (too few pages for the chosen format) or over the maximum (too many for the binding to hold) and the file is rejected. That's a page-count constraint, not a page-number one, and not a parity one. If you've seen an error mentioning page count, it's almost certainly about hitting those limits, not about odd versus even — see the odd page count error and page count rules for the specifics.
So three different "odd/even" worries, three different answers: page numbers (no rule), margins (must alternate), total page count (min/max, not parity).
How to set it up properly
If you use a dedicated formatting tool — Vellum, Atticus, or a professional layout in InDesign — mirrored margins and recto chapter starts are handled automatically. You pick a trim and a style, and the tool flips the gutter and inserts blank pages for you. This is the main reason these tools exist, and why I generally steer first-time authors towards them rather than wrestling with Word.
If you're formatting in Microsoft Word, do this:
- Go to Layout → Margins → Custom Margins.
- Under Multiple pages, choose Mirror margins. Word now shows Inside and Outside margins instead of Left and Right.
- Set a sensible inside (gutter) margin for your page count — bigger for longer books. Confirm the right figure against KDP's current gutter table.
- Use section breaks (not page breaks) before each chapter, and set chapters to start on an odd page if you want recto starts.
- Add page numbers via the footer if you want them — and remember, you don't have to. Plenty of clean paperbacks carry no visible folios at all.
On UK trim sizes: the most common UK paperback size is B-format, 129×198mm. Whatever trim you choose, the gutter still grows with page count, so a 130-page novella and a 450-page memoir at the same trim will need different inside margins. (Worth noting separately for ebooks: UK VAT on ebooks is 20%, which affects pricing but has nothing to do with print margins.)
Common mistakes I see
- Uniform margins on a thick book. Text vanishes into the spine on half the pages. Use mirror margins.
- Confusing page numbers with the gutter. People spend an evening fiddling with footer alignment when the real problem is the inside margin.
- Assuming a blank page is an error. Those intentional blank versos before chapter starts are correct, not a fault.
- Reading a page-count error as a page-number error. If KDP flags page count, check the min/max limits for your trim — it's not about odd versus even.
Frequently asked questions
Do KDP paperbacks need different odd and even page numbers?
No. KDP doesn't require different odd and even page numbers and doesn't mandate any numbering scheme. The page-number style stays the same throughout a book; only its position mirrors on a spread, and even that is convention, not a rule.
Does KDP require page numbers at all?
No. Visible page numbers are optional. Many novels, poetry collections and short-format books are published with no folios. KDP cares that the PDF is the right size, within page-count limits and not corrupted — not whether numbers are present.
What actually has to alternate between left and right pages?
The gutter (inside) margin. On a right-hand page the binding is on the left; on a left-hand page it's on the right. Use mirrored margins so the inner margin swaps sides and text never runs into the spine. The gutter size scales with page count.
Is an odd total page count a problem for KDP?
Generally no — a final page count can be odd or even. KDP enforces minimum and maximum page counts per trim and ink type, not parity. Don't confuse "odd page numbers" with "odd total page count".
Where can I check my book before I upload it?
Run a free KDP Readiness Score — it catches 35+ common issues in about 60 seconds, no signup. If anything fails, the report tells you exactly what to fix.
About this guide
Written by Robert Prime for publishing.co.uk. Last reviewed June 2026. Specs and pricing change — verify current figures with the linked sources before relying on them.
If you'd rather not wrestle with mirror margins and section breaks yourself, our KDP formatting service handles the interior for you, gutter and all, from £69.
