The four things KDP checks first
Most cover upload problems boil down to one of these:
- Dimensions (trim + bleed + spine + back).
- Resolution (DPI) and export settings that keep text crisp.
- Safe zones (text/logos too close to edges or fold areas).
- Barcode clearance (important content covered by the barcode).
Bleed, trim, and safe zones (the practical version)
Your design tool needs a full cover canvas (front + spine + back + bleed), not just the final trim. Keep critical text inside a calm safe zone. If you’re still deciding the book size, read Amazon Book Dimensions: KDP Sizes, Trim Sizes, and Cover Math next—trim choices affect margins, typography scale, and even how thick the spine becomes.
Spine text and barcode: avoid the two most expensive mistakes
Spine layout errors usually happen when the spine width is based on the wrong page count or paper type. Before you commit, verify the logic in Spine Width for KDP: The Practical Guide (+ Calculator Tips). Then keep the back cover clean: reserve a barcode area and avoid placing key content in the lower-right back cover region.
Export checklist (the one you’ll reuse)
- Confirm the full cover dimensions match your calculator output.
- Double-check safe zones for title/subtitle/author name.
- Inspect spine text alignment (centered, not drifting).
- Export with settings that keep text sharp (avoid raster-only exports).
- Do a final preflight pass using Common KDP Cover Mistakes (and How to Fix Them) as a troubleshooting reference.