Cover dimensions are the most unforgiving numbers in self-publishing. Interior formatting has wiggle room; a cover that's 0.1 inch off simply bounces at upload — or worse, prints with your title leaning into the spine fold. Here is every KDP cover measurement for 2026 in one place: the eBook image, the paperback full-wrap formula, spine width by page count, bleed, and the barcode zone.
The eBook cover (the easy one)
Your Kindle cover is just an image — no bleed, no spine, no wrap. Amazon's recommendation:
- 1,600 × 2,560 pixels (width × height) — a 1:1.6 ratio
- JPEG or TIFF, under 50 MB, RGB
- At least 1,000 px on the longest side (but author at full size — thumbnails get regenerated, screens keep getting denser)
The real test of an eBook cover isn't the pixel count — it's whether the title survives at thumbnail size, because that's how every reader first meets it in search results. Design at full size; judge at 80 pixels wide.
The paperback cover (the formula)
Print covers are a single full-wrap PDF at 300 DPI — back cover, spine, and front cover in one file, wrapped around your book. The dimensions come from a formula, not a template guess:
| Measurement | Formula |
|---|---|
| Total width | 0.125″ bleed + back trim + spine + front trim + 0.125″ bleed |
| Total height | trim height + 0.25″ (0.125″ bleed top and bottom) |
| Spine — white paper | page count × 0.002252″ |
| Spine — cream paper | page count × 0.0025″ |
| Spine — premium color | page count × 0.002347″ |
Worked example — a 300-page, 6 × 9 novel on white paper: spine = 300 × 0.002252 = 0.6756″; total width = 0.125 + 6 + 0.6756 + 6 + 0.125 = 12.9256″; total height = 9 + 0.25 = 9.25″. Your cover file is 12.9256 × 9.25 inches, and every one of those digits matters.
Notice what this means in practice: you can't finish the cover before the interior, because page count sets the spine, and page count comes from your typeset interior — trim size, font, leading, and word count all move it. Change any of them late and the wrap needs rebuilding.
Bleed, safe zones, and the barcode
- Bleed: extend background art 0.125″ past trim on all outside edges. Anything that must not be cut off stays at least 0.25″ inside the trim line.
- Spine text: allowed only on books of roughly 80 pages or more, and it needs breathing room — keep text at least 0.0625″ from the spine edges. On thin books, leave the spine blank.
- Barcode zone: KDP prints its ISBN barcode in a roughly 2 × 1.2″ area, bottom-right of the back cover. Don't put critical art or copy there.
Hardcover is a different animal
KDP case-wrap hardcovers use different geometry entirely — wider wrap allowance, board thickness, and a hinge area near the spine — so a paperback template can't be reused. The safe play is to let software that knows both formats generate each wrap from the same book. (Inkbound's cover lab computes paperback and hardcover wraps — spine math, bleed, and safe zones included — from your book's real page count.)
A cover file isn't artwork with a size. It's math with artwork on top.
The five mistakes that bounce uploads
- Building the cover at trim size and forgetting the bleed.
- Using an estimated page count for the spine, then editing the interior.
- Text drifting into the spine fold on the front or back panels.
- A 72-DPI file scaled up to size — KDP wants 300 DPI at final dimensions.
- Covering the barcode zone with art that then gets stamped over.
Every one of these is avoidable if the cover is generated from the finished book instead of assembled beside it. That's the whole argument for doing covers inside your author studio rather than in a separate design app: the spine can't be wrong when it's computed from the pages it will actually hold. And if you're budgeting the whole project, covers are one of the bigger line items a good tool absorbs.
Quick reference
eBook: 1,600 × 2,560 px JPEG/TIFF · Paperback: full wrap at 300 DPI, width = bleed + back + spine + front + bleed, height = trim + 0.25″ · Spine: pages × 0.002252″ (white) or 0.0025″ (cream) · Bleed: 0.125″ · Barcode: 2 × 1.2″ bottom-right, back cover. Print them on a sticky note, or use a tool where they're already built in.