A 6×9 book on IngramSpark requires a PDF/X-1a:2001 compliant file with embedded fonts, CMYK color space (or grayscale), a minimum inside margin of 0.5”–0.75” depending on page count, and a spine width calculated as page count × 0.002252” for white paper or × 0.0025” for cream. IngramSpark’s file review is stricter than KDP’s — most rejections come from missing PDF/X-1a compliance or incorrect color space, not margins.
This page covers every specification for uploading a 6” × 9” paperback interior to IngramSpark.
Key differences from KDP
Before diving into specs, here’s what makes IngramSpark different from KDP for the same 6×9 trim:
| Requirement | KDP | IngramSpark |
|---|---|---|
| PDF format | Standard PDF | PDF/X-1a:2001 required |
| Color space | RGB or Grayscale OK | CMYK or Grayscale only |
| Spine width formula | Same | Same |
| Margin minimums | KDP-specific table | IS-specific (slightly different) |
| Hardcover option | Limited | Full hardcover + dust jacket |
| Distribution | Amazon only | 40,000+ retailers worldwide |
| Setup fee | Free | Free (as of 2025) |
The biggest gotcha: PDF/X-1a compliance. Your PDF must conform to this standard or IngramSpark will reject it outright. Most formatting tools don’t export PDF/X-1a by default — you need to specifically enable it.
Margin requirements for 6×9 on IngramSpark
IngramSpark’s minimum margins differ slightly from KDP’s. The inside margin requirements are generally the same, but IngramSpark is less forgiving about content near the edges.
Minimum inside (gutter) margin
| Page Count | Minimum Inside Margin |
|---|---|
| 1–150 pages | 0.5” |
| 151–400 pages | 0.625” |
| 401–600 pages | 0.75” |
| 601+ pages | 0.875” |
Note: IngramSpark’s gutter minimums are slightly more generous than KDP’s for lower page counts. Where KDP allows 0.375” for books under 150 pages, IngramSpark requires 0.5”.
Minimum outside margins
| Edge | Minimum (no bleed) | Minimum (with bleed) |
|---|---|---|
| Outside | 0.25” | 0.375” |
| Top | 0.25” | 0.25” |
| Bottom | 0.25” | 0.25” |
Recommended professional margins
| Edge | Recommended |
|---|---|
| Inside (gutter) | 0.75”–0.9” |
| Outside | 0.6”–0.75” |
| Top | 0.7”–0.8” |
| Bottom | 0.8”–0.9” |
These recommended margins work for both KDP and IngramSpark — if you format once with these values, your PDF will pass both platforms without changes. Use the KDP Book Calculator to estimate your page count and see which margin tier applies.
Spine width for 6×9 on IngramSpark
IngramSpark uses the same spine width formulas as KDP:
Cream paper (55# paper): Spine width = page count × 0.0025”
White paper (50# paper): Spine width = page count × 0.002252”
Common spine widths
| Pages | Cream Spine | White Spine |
|---|---|---|
| 150 | 0.375” | 0.338” |
| 200 | 0.500” | 0.450” |
| 250 | 0.625” | 0.563” |
| 300 | 0.750” | 0.676” |
| 400 | 1.000” | 0.901” |
IngramSpark allows spine text when the spine is 0.5” or wider. For books under that threshold, your cover must have a blank spine. Get your exact spine width from the Spine Width Calculator.
Cambric exports PDF/X-1a files with correct color space and embedded fonts — select IngramSpark as your target platform and the PDF settings are handled automatically.
Get Cambric — $199
PDF/X-1a export requirements
This is where IngramSpark trips up most self-publishers. PDF/X-1a:2001 is a strict subset of the PDF standard designed for reliable print reproduction.
What PDF/X-1a requires
- All fonts embedded — no linked or substituted fonts
- CMYK or Grayscale color space — no RGB. If your PDF contains any RGB elements (including images), IngramSpark will reject it
- No transparency — all transparency must be flattened
- Output intent specified — the PDF metadata must declare a CMYK output intent
- No JavaScript or form fields — interactive elements are not allowed
- Trim box defined — the PDF must specify the trim size (6” × 9”) in its metadata
How to get PDF/X-1a from common tools
- Adobe InDesign: File → Export → Adobe PDF (Print) → PDF/X-1a:2001 preset
- Affinity Publisher: Export → PDF (for print) → PDF/X-1a profile
- Word: Cannot export PDF/X-1a natively. You’ll need to convert via Adobe Acrobat Pro or use a tool like Cambric that handles it automatically
- Cambric: Select IngramSpark as your output target — the PDF/X-1a settings, font embedding, and color conversion are all applied automatically
If you’re using Word or another tool that can’t produce PDF/X-1a, this is one of the strongest reasons to use dedicated formatting software.
Cover specifications for 6×9 on IngramSpark
IngramSpark provides a cover template generator that gives you exact dimensions. The formula:
Cover width = trim width + spine + trim width + (2 × 0.125” bleed) = 12” + spine + 0.25”
Cover height = 9” + (2 × 0.125” bleed) = 9.25”
Barcode and ISBN placement
IngramSpark requires a barcode zone on the back cover. The standard placement is the lower-right quadrant:
- Barcode area: 2” × 1.2” minimum
- Keep at least 0.25” from any edge
- IngramSpark can place the barcode for you, or you can include it in your cover file
Use the Cover Size Calculator for exact dimensions including spine and bleed areas.
IngramSpark vs KDP: when to use both
Many indie authors publish on both platforms. For a 6×9 book:
- Formatting once for both: Set your margins to IngramSpark’s minimums (slightly stricter) and export two PDFs — one standard PDF for KDP, one PDF/X-1a for IngramSpark.
- Distribution strategy: KDP for Amazon sales (70% royalty), IngramSpark for bookstores, libraries, and international distribution.
- Price considerations: IngramSpark’s printing cost is slightly higher per page, but the wider distribution and returnability make up for it if you’re targeting bookstores.
Cambric lets you create separate edition profiles for KDP and IngramSpark from the same manuscript — different PDF export settings, same interior design.
For a detailed comparison of formatting differences between the two platforms, see KDP vs IngramSpark Formatting.
Common IngramSpark rejections at 6×9
- Not PDF/X-1a compliant — the #1 rejection reason. Check your export settings.
- RGB images in the PDF — even one RGB image will trigger rejection. Convert all images to CMYK or Grayscale before export.
- Fonts not embedded — same as KDP, but IngramSpark is stricter about substituted fonts.
- Spine width mismatch — your cover spine must match the calculated width within 0.06”. If your page count changed, regenerate the cover template.
- Trim size mismatch — the PDF page size must be exactly 6” × 9”. Some export tools add extra space for crop marks — IngramSpark wants the final trim size, not the bleed size.
Related specifications
- 6×9 on KDP — simpler requirements, Amazon-only distribution
- 5.5×8.5 on IngramSpark — most popular fiction trim
- IngramSpark requirements overview — general platform guide
- KDP Book Calculator — page count, spine, cost estimates
- Spine Width Calculator — exact spine for IS cover template
- Cover Size Calculator — full cover dimensions with bleed