KDP error: Barcode / ISBN placement on the cover
Where the ISBN barcode has to sit on a KDP cover, the clear-zone size that triggers the rejection, and how to fix the cover file in one pass before you re-upload.
The library
Cover Design
Expert articles on KDP formatting, self-publishing, and book design for UK authors. 10 guides and counting.
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KDP Formatting
10 articlesSpine width for a 100-page 5.5×8.5 inch KDP paperback
Exact spine width for a 100-page 5.5×8.5 inch KDP paperback — 0.225 in on white paper, 0.250 in on cream. Full cover-wrap dimensions and the KDP spine-width formula.
Spine width for a 100-page 5×8 inch KDP paperback
Exact spine width for a 100-page 5×8 inch KDP paperback — 0.225 in on white paper, 0.250 in on cream. Full cover-wrap dimensions and the KDP spine-width formula.
Spine width for a 200-page 8.5×11 inch KDP paperback
Exact spine width for a 200-page 8.5×11 inch KDP paperback — 0.450 in on white paper, 0.500 in on cream. Full cover-wrap dimensions and the KDP spine-width formula.
Spine width for a 300-page 5×8 inch KDP paperback
Exact spine width for a 300-page 5×8 inch KDP paperback — 0.676 in on white paper, 0.750 in on cream. Full cover-wrap dimensions and the KDP spine-width formula.
Spine width for a 300-page 8.5×11 inch KDP paperback
Exact spine width for a 300-page 8.5×11 inch KDP paperback — 0.676 in on white paper, 0.750 in on cream. Full cover-wrap dimensions and the KDP spine-width formula.
KDP error: Cover dimensions don't match interior trim
Why KDP rejected your book for cover-interior trim mismatch — and the exact fix. UK-specific, 2026 spec.
KDP error: Cover text or critical elements in bleed zone
Why KDP rejected your cover for text in the bleed zone — and the exact fix. UK-specific, 2026 spec.
KDP error: Cover under 2560×1600 pixels
Why KDP rejected your ebook cover for being too small — and the exact fix. UK-specific, 2026 spec.
KDP error: Spine too narrow for spine text
Why KDP rejected your cover for spine text on a too-thin book — and the exact fix. UK-specific, 2026 spec.
Tools & Software
5 articlesSpine width for a 100-page 5.5×8.5 inch KDP paperback
Exact spine width for a 100-page 5.5×8.5 inch KDP paperback — 0.225 in on white paper, 0.250 in on cream. Full cover-wrap dimensions and the KDP spine-width formula.
Spine width for a 100-page 5×8 inch KDP paperback
Exact spine width for a 100-page 5×8 inch KDP paperback — 0.225 in on white paper, 0.250 in on cream. Full cover-wrap dimensions and the KDP spine-width formula.
Spine width for a 200-page 8.5×11 inch KDP paperback
Exact spine width for a 200-page 8.5×11 inch KDP paperback — 0.450 in on white paper, 0.500 in on cream. Full cover-wrap dimensions and the KDP spine-width formula.
Spine width for a 300-page 5×8 inch KDP paperback
Exact spine width for a 300-page 5×8 inch KDP paperback — 0.676 in on white paper, 0.750 in on cream. Full cover-wrap dimensions and the KDP spine-width formula.
Spine width for a 300-page 8.5×11 inch KDP paperback
Exact spine width for a 300-page 8.5×11 inch KDP paperback — 0.676 in on white paper, 0.750 in on cream. Full cover-wrap dimensions and the KDP spine-width formula.