Upload
Add an interior or cover PDF. The original file remains unchanged.
Know what KDP will flag — and fix what is safe — before you upload again.
Upload an interior or cover PDF. See exact pages, measurements, repair eligibility, and a fully rechecked output.
- Original preserved
- Deterministic rules
- Every safe fix is rechecked
Upload
Measure
Findings
Safe fix
Recheck
CHAPTER ONEA measured beginning12
File readyOriginal remains unchanged
20%From uploaded PDF to verified output
Measure
Every page is inspected for geometry, fonts, images and print zones.
See evidence
Each finding keeps its page, actual value, expected value and versioned rule.
Fix what is safe
Only deterministic options that pass loss checks become available for preview.
Complete post-flight
The repaired output is analyzed again and receives a deterministic output digest.
A checker stops at the warning. BookPreflight carries safe cases through repair and post-flight.
We do more than name the issue. We measure the cause, preview an eligible action, check for visible loss and inspect the complete output again.
See the safe-repair workflowBefore · finding
Inside margin too small
After · post-flight
Repaired and rechecked
Built for print precision
Measurements, sources and limitations remain visible from upload to output.
BookPreflight is an independent tool and is not affiliated with, endorsed by, or sponsored by Amazon or Kindle Direct Publishing. Results describe checks against the selected BookPreflight rule set and do not guarantee acceptance.
01
Measurements, not mystery
Every finding keeps the actual value, expected value, unit, page, rule ID, rule-set version and official source.
02
Safe means rechecked
Automatic repair is offered only when no visible content is lost and the complete output passes a fresh analysis.
03
Unsafe work is never disguised
Files that need reflow, missing content or design judgment are routed to user choice or manual work before a fix charge.