Converter
KDP trim sizes, and how to choose one
The trim you pick changes your page count, your printing cost per copy, and how the book reads in the hand.
KDP's most-used paperback trims for text-led books are 5×8, 5.25×8, 5.5×8.5 and 6×9 inches (with A5 common outside the US, and larger trims like 7×10 and 8.5×11 reserved for manuals and workbooks). The choice is not cosmetic: printing cost is per page, and the same 90,000-word manuscript that sets 217 pages at 6×9 grows to 314 pages at 5×8 — we measured it by typesetting the identical file at each size. Genre expectations matter as much: mass-market-feel fiction leans compact (5×8, 5.25×8), trade fiction and memoir sit at 5.5×8.5 and 6×9, and 6×9 is the safe default for a first book. Whatever you choose, KDP requires the interior PDF's page size to match the trim exactly and the gutter to match your final page count — both checked automatically in Ceeryo's preflight.
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Last updated: August 5, 2026 · Reviewed by the Ceeryo team
Interior theme
Print-ready PDF + EPUB. Your words never change — only the typography.
Real output
What the typeset pages actually look like
Chapter opener and body page from each interior theme — rendered from the engine's real output at 6×9, not mockups.
How it works
How to kdp trim sizes, and how to choose one in four steps
The fastest way to kdp trim sizes, and how to choose one without manual copy-paste, screenshots, or formatting cleanup.
- Step 1
Upload your manuscript
Drop in the .docx manuscript you have finished writing. Your file is processed only to typeset it and is never used to train models.
- Step 2
Chapters are detected
Chapter openings, scene breaks and italics are found automatically, without changing a word of your text.
- Step 3
The book is typeset
Trim size, margins and gutter, running heads, drop caps and chapter openers are set as a real book interior.
- Step 4
Download print PDF + EPUB
A print-ready interior PDF at your chosen trim size plus a clean EPUB, checked against the geometry KDP enforces.
In short
Common KDP trims for novels and memoirs: 5×8, 5.25×8, 5.5×8.5 and 6×9 inches (A5 outside the US). 6×9 is the default for trade paperbacks; compact trims read as fiction but add pages — a 90,000-word book measured 217 pages at 6×9 vs 314 at 5×8. The interior PDF must match the trim exactly.
What is the best trim size for a KDP paperback?
6×9 inches is the most common and safest choice for novels, memoirs and general non-fiction — cheapest per copy because it holds the most words per page (~217 pages for 90,000 words, measured). Choose 5×8 or 5.25×8 for a classic compact fiction feel (the same book runs ~291–314 pages), and 5.5×8.5 as the middle ground. Match genre shelf-mates when in doubt.
Cost math
Trim choice is a printing-cost decision
KDP's print cost is a fixed fee plus a per-page charge, so the ~97 extra pages between 6×9 and 5×8 for the same 90,000 words is pure per-copy cost — which comes straight out of royalties at a fixed list price. Compact trims are a deliberate aesthetic trade, not a free one.
- Same 90k manuscript, measured per trim: 6×9 → 217pp · 5.5×8.5 → 253pp · A5 → 245pp · 5.25×8 → 291pp · 5×8 → 314pp
- Per-page print charge makes each step real money per copy
- Interior PDF page size must equal the trim exactly — the classic rejection
- Gutter minimum rises with page count (0.375" → 0.875")
Features
Why teams choose Ceeryo for kdp trim sizes, and how to choose one
Five trims, one upload
Typeset at 6×9, 5×8, 5.25×8, 5.5×8.5 or A5 and compare real page counts.
Exact-size pages guaranteed
Every page of the output PDF is exactly your chosen trim — verified in preflight.
Gutter follows the count
The inside margin is set from your book's final page count per KDP's brackets.
Use cases
Where kdp trim sizes, and how to choose one works best
First-time publishers
Start at 6×9 unless your genre's shelf clearly says otherwise.
Cost optimizers
See exactly how many pages each trim adds before locking the list price.
Series consistency
Keep every installment on the same trim and theme for a matched shelf.
Why not just copy-paste?
Ceeryo vs. doing it manually
Fixing formatting by hand takes ages and rarely comes out consistent. Here's the difference.
Output quality
What the cleaned document looks like
Every kdp trim sizes, and how to choose one run produces a preflight-checked print PDF and a clean EPUB — never a rewrite of your words. Here's what you get.
- All five supported trims produce KDP-exact page dimensions
- Measured page-count comparisons, not rules of thumb
- Preflight verifies size, page range, gutter and fonts
- Print PDF and EPUB from the same upload
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KDP margin checker
Every margin calculator repeats Amazon's table. The question that gets books rejected is whether your PDF actually meets it.
printformatterFormat Your Book for Amazon KDP in Minutes
Upload your .docx manuscript, pick a trim size and interior theme, and download a print-ready PDF that passes KDP's checks — plus an EPUB for the Kindle edition.
printformatterFormat Your Manuscript as a 6×9 Book
6×9 in is the standard trade-paperback trim. Upload your Word manuscript and get a 6×9 interior PDF with the margins and gutter exactly right.
trimformatterFormat Your Novel as a 5×8 Book
The compact trim classic fiction is printed at. Upload your manuscript and get a 5×8 interior with the type sized for the smaller page.
trimformatterTurn Your Manuscript into a Print-Ready PDF
From double-spaced draft to typeset book interior — trim size, margins, chapter design, and preflight in one pass.
printformatterFormat Your Paperback Interior
The inside of the book, done to trade standards — so your paperback reads like it came from a publisher.
printformatter
Frequently asked questions
Which trim sizes does KDP support?+
KDP supports a range from 5×8 up to 8.5×11 inches. For text-led books the common choices are 5×8, 5.25×8, 5.5×8.5 and 6×9; check KDP's print options page for the full current list, and note some sizes limit page-count ranges.
Can I change trim after publishing?+
You can upload a new interior at a different trim, but it requires a new print setup and your cover must be resized to match the new spine width — the page count changes, so the spine does too.
Is A5 available on KDP?+
Yes — A5 (148×210mm) is supported and popular for non-US markets. Our 90,000-word test manuscript set 245 pages at A5.
Compare trims with your actual manuscript
Upload once, typeset at any trim, and see the real page count and preflight for each — free to preview.