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Amazon KDP Cover & Binding Guide: Spine Width & Templates

Quick Answer

Amazon KDP enforces publishing validation when manuscript, cover, formatting, bleed, or metadata checks do not meet print and policy requirements.

A book's cover is a single PDF file that includes the back cover, spine, and front cover as one continuous image. Rejections in this category are usually due to incorrect mathematical calculations of the spine width or failing to include the mandatory bleed.

1. Spine Width Calculation

The thickness of your book's spine is determined solely by the number of pages and the paper type (White, Cream, or Color). - Spine Too Narrow: KDP requires a minimum of 79 pages for white paper or 100-110 pages for other types before you can add text to the spine. If your book is thinner, the spine must remain blank. - Formula: - White Paper: Page count * 0.002252" - Cream Paper: Page count * 0.0025"

2. Cover Size & Dimensions

  • Cover Size Mismatch: Your cover PDF must equal: (Front Cover Width + Back Cover Width + Spine Width + 0.25" Bleed).
  • Common Error: Forgetting that the 0.125" bleed must be added to all four outer edges, totaling 0.25" in width and 0.25" in height added to the base dimensions.

3. Templates & Layout

  • Cover Template Error: Using a generic template or one from a different printer (like IngramSpark) will cause alignment issues.
  • Barcode Placement: Do not place important text or images in the lower right corner of the back cover, as KDP will print a barcode there if you don't provide your own.

4. Recovery Strategy

  1. Use the KDP Generator: Always download the official KDP Cover Calculator and Template generator for your specific page count.
  2. Check PDF Box Sizes: Ensure your PDF "Media Box" matches the required dimensions exactly.
  3. Verify Spine Alignment: Use the online Previewer to ensure your spine text is centered and not overlapping the fold lines.

Back to: KDP Print Hub