Specs aren’t scary – they’re the rails that keep your design crisp in print. This guide explains book cover dimensions and bleed in plain language: trim size, bleed, safe area, and spine math – plus printer-ready exports for KDP and IngramSpark.
Table of Contents
- Key Terms: Trim, Bleed, Safe Area, Spine
- Spine & Layout Math (The Safe Way)
- KDP: What Files to Export
- IngramSpark: What Files to Export
- Pre-Press Checks Before You Upload
- FAQ
Key Terms: Trim, Bleed, Safe Area, Spine
- Trim size: The final width × height of your book after it’s cut. Your design must match this spec.
- Bleed: Extra image area beyond trim so color/imagery runs clean to the edge after trimming (no white slivers).
- Safe area: A margin inside the trim where no critical text or logos should appear (keeps content off the blade).
- Spine width: Depends on page count and paper stock. Use your printer’s calculator or profile to get the exact value.
Spine & Layout Math (The Safe Way)
Work from a printer template (KDP/IngramSpark). Input trim size, page count, and paper stock; they’ll return exact spine width and margins. Build your canvas to that template, then layer your design on top. This avoids guesswork and reprints. We provide a free layout generator here that works quite well with KDP’s paperback format.
- Canvas structure: Full spread = back + spine + front. Add the required bleed around all outer edges.
- Barcode zone: Keep imagery low-contrast behind the barcode or leave it blank for clarity.
- Type safety: Titles, author name, and blurbs should sit comfortably inside the safe area—test at 100–150px for legibility.
KDP: What Files to Export
- Paperback/Hardcover spread: Press-ready PDF (template geometry locked, fonts embedded, images at printer-recommended DPI).
- Ebook cover hero: High-resolution JPG/PNG (front only) sized for digital storefronts.
- Alt crops: Social thumbnails and mockups for launch assets.
IngramSpark: What Files to Export
- Spread: Press-ready PDF following Ingram’s template (bleed + safety as provided).
- Color profile: Use the printer’s recommended profile; avoid last-minute conversions at upload time.
- Series scaling: If a series, duplicate the template and update only spine width + copy to maintain consistency.
Pre-Press Checks Before You Upload
- Trim size matches product setup
- Bleed present on all outer edges
- Text/logos inside safe area (front, spine, back)
- Correct spine width for page count + paper stock
- Barcode zone clear (or adequate contrast)
- Fonts embedded; images at recommended DPI
FAQ
How do I calculate spine width?
Use the official printer calculator for your trim, page count, and paper stock. Don’t guess—templates ensure accuracy.
Can I reuse the same file for KDP and IngramSpark?
Often you’ll need separate exports because template geometry and bleed/safety rules can differ. Start from the printer’s own file each time.
Do I need different files for ebook and print?
Yes. Ebook uses the front cover only; print requires the full spread with spine and bleed.
