What does a print-on-demand service actually need from my PDF?

A POD printer (KDP, Lulu, IngramSpark) prints exactly what you upload, so your PDF must match their physical spec precisely: the correct trim size, all fonts embedded, the right margins (and gutter) for the page count, bleed if any element runs to the page edge, and usually a separate interior file and cover file. Each platform publishes a template and exact requirements, and they vary, so always build to the specific platform's spec rather than a generic one. The single most common cause of rejection or an ugly proof is a mismatch between the PDF and the platform's requirements — get those right and the rest is straightforward.

What is bleed and do I need it?

Bleed is extra image area that extends beyond the final trim line — typically about 0.125 inches (3 mm) — so that when the printer cuts the page, color or images that are meant to reach the edge actually do, with no thin white sliver from cutting tolerance. You need bleed only if something (a background, a photo, a color band) is designed to run to the edge of the page. A book whose content sits within margins, with white page edges, does not need bleed. If you do use it, set up the document at trim-plus-bleed and let the printer's template tell you the exact amount; mismatched bleed is a frequent proof problem.

How do margins and the gutter work for a bound book?

Two things: the outer margin (safe area) keeps text from being cut off or crowding the edge, and the gutter is extra inner-margin space that accounts for the binding eating into the page where it is glued. Crucially, the gutter needs to grow with page count — a thick book bends less flat, so more of the inner page disappears into the spine, and platforms specify a larger gutter for higher page counts. Use the platform's margin/gutter guidance for your page count; too small a gutter makes text near the spine hard to read in the finished book.

Why must fonts be embedded, and how do I check?

The printer's system must reproduce your text exactly, and it cannot rely on having your fonts installed — so every font has to be embedded in the PDF. A non-embedded font is one of the most common rejection reasons, and even if accepted, it can be substituted and reflow your carefully-set pages. Embed (and subset) all fonts when you export, then verify before uploading by checking that no fonts are listed as non-embedded. If your layout uses an unusual or licensed font, also confirm its license permits embedding for print. Verifying font embedding is a two-minute check that prevents a frustrating rejection cycle.

Do I upload one PDF or separate interior and cover files?

Almost always two separate PDFs: the interior (your book's pages) and the cover (a single spread covering back, spine, and front). The cover is the trickier one because its dimensions depend on the final page count and the paper stock — more pages means a wider spine — so you generate the cover to the exact spine width the platform calculates for your book. Build the interior first, finalize the page count, then create the cover to match. Uploading a cover sized for the wrong page count is a classic error that produces a misaligned spine on the proof.

What about color — RGB or CMYK?

Print presses use CMYK ink, so color intended for print is most predictable in CMYK; vivid RGB colors (especially bright blues and greens) can shift noticeably when converted for press. For a color-interior book, work in or convert to CMYK and expect printed colors to look slightly more muted than on screen. For a standard black-and-white interior (most novels and non-illustrated books), grayscale is what you want, and you avoid color concerns entirely. Always order a physical proof before approving — screen color never perfectly predicts the printed result, and the proof is your last check before copies ship.

How do I avoid a rejection, and is it safe to prep this online?

Run a pre-flight pass: confirm trim size matches the platform template, fonts are all embedded, margins/gutter suit the page count, bleed is correct (or absent) and consistent, and interior and cover are separate and correctly sized — then order a proof. For privacy, an unpublished manuscript is your intellectual property; prefer a tool that processes files locally. ScoutMyTool checks font embedding, adds bleed/trim marks, resizes pages, and converts entirely in your browser tab, so your manuscript never leaves your machine. Confirm any tool processes locally before uploading an unpublished book.

6 min read

How to make a print-on-demand book PDF (KDP + Lulu)

By ScoutMyTool Editorial Team · Last updated: 2026-05-21

My first self-published proof arrived with the page numbers half-swallowed by the spine and a cover whose spine text was off-center — both because I had guessed at the specs instead of building to them. Print-on-demand is wonderful: upload a PDF, and KDP, Lulu, or IngramSpark print and ship copies on demand. But the printer prints exactly what you give it, so a print-ready book PDF has to match the platform’s physical spec precisely — trim size, bleed, margins and gutter, embedded fonts, separate interior and cover. This guide walks through preparing that PDF and the pre-flight checks that stop the rejection (or ugly proof) that catches almost every first-time self-publisher.

The specs a POD book PDF must hit

Spec	What it means	Watch out
Trim size	Final book dimensions (e.g. 6×9 in)	Pick from the platform’s supported list
Bleed	Art extends past trim (~0.125 in)	Needed only if images run to the edge
Margins / gutter	Safe area + inner binding space	Gutter grows with page count
Embedded fonts	Fonts included in the file	Required; non-embedded = rejection
Interior vs cover	Two separate PDFs	Cover size depends on page count + paper
Color space	CMYK for color print; gray for B/W	RGB can shift on press
PDF/X (optional)	Print-ready PDF profile	Some printers prefer/require it

Step by step — prepare a print-ready book PDF

Get the platform’s template and spec. KDP, Lulu, and IngramSpark each publish exact trim sizes, margin/gutter tables, and cover calculators. Build to the specific platform, not a generic spec.
Set the interior to the right trim size and margins. Match the trim size and use the margin/gutter for your page count; resize pages if your export is the wrong size.
Add bleed only if needed. If images run to the edge, set up trim-plus-bleed and add bleed and trim marks to the platform’s amount; otherwise skip it.
Embed and verify all fonts. Embed/subset on export, then confirm with Font Embedding Check — non-embedded fonts are a top rejection cause. See embedding fonts.
Finalize page count, then build the cover. Generate the cover spread to the spine width the platform calculates for your page count and paper — interior first, cover second.
Mind color and a print-ready profile. CMYK/grayscale as appropriate; some printers prefer a PDF/X profile — convert with a print/archival PDF converter if required. See PDF compatibility.
Pre-flight, then order a proof. Re-check trim, fonts, margins, bleed, and that interior and cover are separate and correctly sized — then always order a physical proof before approving. See print-ready PDFs.

Print-on-demand PDF basics: the broader overview.
Publishing an eBook: the digital companion to print.
PDF for Kindle: the e-book side of KDP.
Embedding fonts: the top rejection-preventer.
Print-ready PDFs: the pre-flight mindset.
Font Embedding Check: verify before uploading.
All ScoutMyTool PDF tools: the full toolkit.

FAQ

What does a print-on-demand service actually need from my PDF?: A POD printer (KDP, Lulu, IngramSpark) prints exactly what you upload, so your PDF must match their physical spec precisely: the correct trim size, all fonts embedded, the right margins (and gutter) for the page count, bleed if any element runs to the page edge, and usually a separate interior file and cover file. Each platform publishes a template and exact requirements, and they vary, so always build to the specific platform's spec rather than a generic one. The single most common cause of rejection or an ugly proof is a mismatch between the PDF and the platform's requirements — get those right and the rest is straightforward.
What is bleed and do I need it?: Bleed is extra image area that extends beyond the final trim line — typically about 0.125 inches (3 mm) — so that when the printer cuts the page, color or images that are meant to reach the edge actually do, with no thin white sliver from cutting tolerance. You need bleed only if something (a background, a photo, a color band) is designed to run to the edge of the page. A book whose content sits within margins, with white page edges, does not need bleed. If you do use it, set up the document at trim-plus-bleed and let the printer's template tell you the exact amount; mismatched bleed is a frequent proof problem.
How do margins and the gutter work for a bound book?: Two things: the outer margin (safe area) keeps text from being cut off or crowding the edge, and the gutter is extra inner-margin space that accounts for the binding eating into the page where it is glued. Crucially, the gutter needs to grow with page count — a thick book bends less flat, so more of the inner page disappears into the spine, and platforms specify a larger gutter for higher page counts. Use the platform's margin/gutter guidance for your page count; too small a gutter makes text near the spine hard to read in the finished book.
Why must fonts be embedded, and how do I check?: The printer's system must reproduce your text exactly, and it cannot rely on having your fonts installed — so every font has to be embedded in the PDF. A non-embedded font is one of the most common rejection reasons, and even if accepted, it can be substituted and reflow your carefully-set pages. Embed (and subset) all fonts when you export, then verify before uploading by checking that no fonts are listed as non-embedded. If your layout uses an unusual or licensed font, also confirm its license permits embedding for print. Verifying font embedding is a two-minute check that prevents a frustrating rejection cycle.
Do I upload one PDF or separate interior and cover files?: Almost always two separate PDFs: the interior (your book's pages) and the cover (a single spread covering back, spine, and front). The cover is the trickier one because its dimensions depend on the final page count and the paper stock — more pages means a wider spine — so you generate the cover to the exact spine width the platform calculates for your book. Build the interior first, finalize the page count, then create the cover to match. Uploading a cover sized for the wrong page count is a classic error that produces a misaligned spine on the proof.
What about color — RGB or CMYK?: Print presses use CMYK ink, so color intended for print is most predictable in CMYK; vivid RGB colors (especially bright blues and greens) can shift noticeably when converted for press. For a color-interior book, work in or convert to CMYK and expect printed colors to look slightly more muted than on screen. For a standard black-and-white interior (most novels and non-illustrated books), grayscale is what you want, and you avoid color concerns entirely. Always order a physical proof before approving — screen color never perfectly predicts the printed result, and the proof is your last check before copies ship.
How do I avoid a rejection, and is it safe to prep this online?: Run a pre-flight pass: confirm trim size matches the platform template, fonts are all embedded, margins/gutter suit the page count, bleed is correct (or absent) and consistent, and interior and cover are separate and correctly sized — then order a proof. For privacy, an unpublished manuscript is your intellectual property; prefer a tool that processes files locally. ScoutMyTool checks font embedding, adds bleed/trim marks, resizes pages, and converts entirely in your browser tab, so your manuscript never leaves your machine. Confirm any tool processes locally before uploading an unpublished book.

Citations

Wikipedia — “Print on demand,” how POD publishing and printing works. en.wikipedia.org/wiki/Print_on_demand
Wikipedia — “Bleed (printing),” on bleed, trim, and cut tolerance. en.wikipedia.org/wiki/Bleed_(printing)
Wikipedia — “PDF/X” (ISO 15930), the print-production PDF profile. en.wikipedia.org/wiki/PDF/X

Upload with confidence, not crossed fingers

Check font embedding, add bleed and trim marks, and size your pages for KDP or Lulu with ScoutMyTool’s in-browser tools — your manuscript never leaves your machine.

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