Use this checklist to align trim, bleed, and margin decisions before upload so KDP Previewer checks stay clean and predictable.
Choose trim and bleed as a pair
Common trim sizes for trade paperbacks are 5 x 8, 5.25 x 8, 5.5 x 8.5, and 6 x 9. Pick one and keep it fixed during final proofing.
Use bleed only when content touches the edge of the page. For text-only interiors, no-bleed usually gives a simpler final check path.
Use page-count-based gutter targets
Inside (gutter) margin usually needs to increase as page count grows, or inner text can crowd the spine side in print.
Use the table below as a quick working reference, then verify the latest KDP requirements before final upload.
Validate margins using the final exported PDF
Always evaluate margins in the exported PDF and KDP Previewer, not only in the editor view.
Focus on first chapter pages, ornament-heavy pages, and any page with unusual spacing where margin warnings are most likely to appear.
Handle warning patterns quickly
If text appears too close to trim, reduce manual spacing hacks in source and re-export. If page breaks move, confirm trim/bleed was not changed mid-pass.
If you must change trim size late, treat that as a new release pass: export again and rerun Previewer before publishing.
Numbers and Reference Tables
Gutter Quick Reference (KDP paperback interiors)
Working reference for fast checks. Confirm latest KDP values before launch.
Final page count
Suggested inside margin (gutter)
Suggested outside margin
Practical note
24-150 pages
0.375 in (9.6 mm)
0.25 in (6.4 mm)
Use for shorter books with stable chapter layout.
151-300 pages
0.50 in (12.7 mm)
0.25 in (6.4 mm)
Most common trade-paperback range.
301-500 pages
0.625 in (15.9 mm)
0.25 in (6.4 mm)
Expect tighter spine-side readability if gutter is too small.
501-700 pages
0.75 in (19.1 mm)
0.25 in (6.4 mm)
Run an extra print proof pass before upload.
701-828 pages
0.875 in (22.2 mm)
0.25 in (6.4 mm)
Treat as high-risk for margin drift and run deeper checks.
Publish Checklist
Lock one trim size in KDP before final proofing.
Choose bleed intentionally: yes only when content runs to page edge.
Record final page count from the exact PDF you will upload.
Select inside margin target from the page-count table.
Confirm outside margin target remains consistent across chapters.
Check chapter-open pages for top/bottom crowding.
Check pages with ornaments or images for trim-safe placement.
Check odd/even pages near the middle of the book where spine pressure is highest.
Capture one screenshot of KDP print setup (trim/bleed/paper) for release notes.
Capture one screenshot of any margin warning page before and after fixes.
Re-export after source fixes and rerun Previewer on the newest file only.
Save one final release-candidate PDF and use that exact file for upload.
Proof Checks
Screenshot evidence packet for print QA
Capture KDP print setup page showing trim size, bleed, and paper settings.
Capture at least two Previewer screenshots: one chapter-open page and one ornament/image page.
Capture before/after screenshots for any margin warning you resolved.
Common margin-failure checks before upload
Verify the PDF page count used in your gutter decision matches the file you upload.
Confirm no last-minute trim or bleed changes were made after final Previewer pass.
Spot-check 10 random pages for consistent text distance from trim edges.
The Senswriter way (faster)
Use the same workflow in one workspace: draft, export, run checks, fix source, and publish one clean release-candidate file.
Write and reorganize chapters/scenes without switching between multiple tools.
Generate print-ready PDF, EPUB, and DOCX from the same manuscript source.
Re-export quickly after fixes so KDP and EPUB checks stay repeatable.
Use optional BYOK AI assist only if you want drafting support.