Unexpected blank pages usually come from hidden breaks, section drift, or chapter parity rules applied inconsistently. Use this source-first checklist to locate the cause, fix it once, and verify in Previewer.
Decide where blank pages are intentional
Some books intentionally start each chapter on the right-hand page. If that is your design rule, document it first so your QA pass can separate intentional blanks from accidental ones.
If your edition does not require right-hand chapter starts, remove parity rules that force extra blanks.
Lock this decision before final proofing to avoid chasing false positives later.
Find source-level blank-page causes before export
Inspect chapter transitions for accidental page breaks, duplicated section breaks, and stacked empty paragraphs.
Normalize chapter-open styles so one chapter does not use manual spacing while another uses style-driven spacing.
When importing from DOCX, check copied chapters for hidden breaks left from prior templates.
Control section behavior and pagination rules
Keep section-break usage minimal and deliberate. Too many section boundaries increase pagination surprises.
If headers/footers or numbering restart unexpectedly, verify section links and numbering settings before re-export.
After any major chapter edit, rerun a short chapter-transition pass before full Previewer review.
Validate in Previewer, then fix source and re-export once
In KDP Previewer, inspect every chapter open plus the page before each chapter. These are the highest-risk zones for accidental blank inserts.
When you find a blank-page issue, fix source manuscript structure and export a fresh PDF; do not patch the final PDF file.
Use one release-candidate naming pattern so you always know which file includes your latest blank-page fixes.