What to check
1. For a Kindle store cover, Amazon currently describes 2,560 × 1,600 pixels as the ideal portrait size
For a Kindle store cover, Amazon currently describes 2,560 × 1,600 pixels as the ideal portrait size.
2. A print front panel starts with the selected trim size, but a production file must add the spine, back, and required bleed or wrap
A print front panel starts with the selected trim size, but a production file must add the spine, back, and required bleed or wrap.
3. Calculate from the final formatted page count
Calculate from the final formatted page count. A manuscript edit that changes pagination also changes the spine.
Use the final production inputs
Calculate from the final formatted page count, not the manuscript estimate. Select the exact trim, binding, interior type, and paper stock before creating the cover sheet. If any of those values change, regenerate the dimensions and compare the exported PDF against the printer's current template.
Artwork, type, spine, and back-cover copy remain editable when the print setup changes.
Sources: Amazon KDP cover preparation. Recheck the current printer template before export.