How to Format a Print Book for KDP
KDP print formatting is a sequence of technical decisions — trim size, margin depths, font choices, bleed settings, PDF export specs — where each choice affects how your book looks in readers' hands. Get the specs right the first time and avoid the most common file rejections that delay your launch.
Start Your ARC Campaign →KDP Print Formatting: The Key Decisions
Trim Size Selection
6×9 for most adult fiction trade paperbacks — check your genre's bestsellers and match their physical format
Interior Margin Setup
Mirror margins with gutter depth scaled to page count — the most critical setting for professional readability
Bleed Configuration
0.125" bleed on all cover edges; interior bleed only needed if design elements touch the page edge
Font and Typography
Serif body font at 10-12pt with 120-130% leading — Garamond, Minion Pro, or Palatino for professional print quality
PDF Export Specs
PDF/X-1a or PDF/X-4 with all fonts embedded — standard screen PDFs fail KDP's print processing
Pre-Submit Preview
KDP's print previewer catches resolution, margin, and layout issues before submission — always review in full
Ready to Launch Your Print Book?
Once your print formatting is clean, the next step is building your launch review base. ARC readers help you arrive on Amazon with verified purchase reviews that drive early discoverability.
Start Your ARC Campaign →Frequently Asked Questions
What trim size should I choose for my KDP print book?
KDP print trim size selection depends on genre. The most common fiction trim size is 6×9 inches — a standard trade paperback format that reads professionally and keeps page counts reasonable for most novels. For genre fiction (romance, thriller, fantasy), 5.5×8.5 is also widely used and produces a slightly smaller, pocketable paperback. For shorter works or nonfiction, 5×8 is common. Large print editions typically use 6×9 or 7×10. Children's books use square or landscape formats (8×8, 8.5×8.5). The trim size you choose affects your page count (a larger trim has fewer pages per word count), your price floor (more pages cost more to print), and your margin requirements. For most authors writing adult fiction or narrative nonfiction, 6×9 or 5.5×8.5 are the professional defaults. Check bestsellers in your genre and match their trim format — readers have physical expectations for genre books that affect how your book feels in hand.
What are the correct interior margin settings for KDP print?
KDP interior margin requirements depend on page count because thicker books need more gutter (inner margin) to ensure text doesn't disappear into the spine. KDP's minimum gutter margins: up to 150 pages: 0.375 inches; 151-400 pages: 0.75 inches; 401-600 pages: 0.875 inches; 601+ pages: at least 1 inch. Outside margins (top, bottom, outside edge) are more flexible: 0.25 inches minimum but 0.5-0.75 inches reads more professionally and gives the page visual breathing room. A common professional interior margin layout for a 6×9 novel of 300-400 pages: gutter 0.875 inches, outside edge 0.75 inches, top 0.75 inches, bottom 0.75 inches. Mirror margins (opposite pages are mirror images) are essential for print — verify your word processor or design software has mirror margins enabled. Headers and page numbers should sit within the live area, outside the margin safety zones.
How do I handle bleed settings for KDP print covers and interior?
Bleed refers to design elements (images, color backgrounds) that extend to the physical edge of the page after trimming — requiring the design to extend 0.125 inches (1/8 inch) beyond the trim line on each edge. For KDP print: covers always require bleed — your cover file should be sized to trim dimensions plus 0.125 inches bleed on each edge. Use the KDP cover template calculator to get the exact file size for your trim and page count (spine width changes with page count). Interior pages with bleed — full-page images, chapter opener backgrounds — also require bleed set correctly in your file. Most interior pages in text-heavy fiction have no bleed (all text sits within margins), so bleed is primarily a cover concern for most authors. If your interior has decorative elements touching the page edge (maps, illustrated chapter openers), set the full interior to 'bleed' in your PDF export settings.
What fonts work best for KDP print book interiors?
Professional print book body text uses serif fonts — the small strokes at the ends of letterforms that aid horizontal eye tracking on the printed page. Excellent choices for novel interiors: Garamond (classic and space-efficient — good for long books), Times New Roman (widely used, recognizable as professional), Palatino/Book Antiqua (slightly wider, elegant), Minion Pro (the current industry standard in traditional publishing — used by most major publishers). Body text size for adult fiction: 10-12pt depending on font and trim size; 11pt is a safe default for most settings. Leading (line spacing) for print interiors: 120-130% of font size (so 13-14pt leading for 11pt text). Chapter headings can use a contrasting sans-serif or a decorative serif. The most common mistake: using system default fonts (Calibri, Arial) that look clean on screen but read as unprofessional in print. Download and use a proper book-body serif font.
What are the most common reasons KDP rejects print files?
Common KDP print file rejection causes: low-resolution images (all images must be 300 DPI at print size — screen-resolution images print blurry); text or important elements in the bleed zone (content placed within 0.125 inches of the trim line may be cut off); incorrect page count (your PDF must match the page count KDP calculates for your manuscript — odd vs. even total pages can cause errors); missing fonts (embed all fonts when exporting to PDF — KDP cannot render fonts it doesn't have); cover size mismatch (your cover dimensions don't match the trim size + spine width + bleed KDP calculates for your page count); PDF exported at incorrect settings (export as PDF/X-1a or PDF/X-4 for print — standard screen PDFs may not process correctly); and transparent backgrounds (flatten all layers and remove transparency before export). KDP provides a print previewer that catches most issues before submission — always review the full previewer before clicking Submit.