Publishing field guide

Ebook Formats: Choose PDF, EPUB and DOCX for the job each format does best

Understand reflowable and fixed layouts, what Kindle accepts and why one master file rarely serves every channel perfectly.

Reviewed by Stefan Mitrović, Founder of Automateed · Updated July 16, 2026

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60-second summary

Quick answer

There are three working ebook formats, each with a different job: PDF fixes the layout for lead magnets, workbooks and print; EPUB reflows for e-readers and every major bookstore; DOCX stays editable for handoffs. No single master file serves all channels well. Automateed exports all three from the same book project, so you choose per destination instead of converting one file into another.

Real product steps

How to export the right format in Automateed

Format choice happens at export time, not writing time — the same manuscript, cover and design produce every output.

Workflow map

The ebook formats path inside one account

Finish the project once

Write, edit and design the book in Book Studio without committing to a format. Structure — real chapters, headings and image placement — is what makes every later export clean.

Open the Export dialog

Use the Export button in the editor header or the Export book icon in your Library. The five format cards — PDF, KDP, EPUB, DOCX, Audio — sit beside a summary of chapters, words and estimated pages.

Export PDF for fixed-layout jobs

Choose PDF (free on every plan), pick a page size — Trade 6" × 9" for book-like output, US Letter or A4 for worksheets — and set the table of contents, copyright and author-page toggles before downloading.

Export EPUB for stores and e-readers

Choose EPUB on a paid plan for Kindle and other retailers. The output is reflowable: readers control font size and the text adapts to any screen.

Export DOCX for editing handoffs

Choose DOCX when a human editor, translator or co-author continues the work in a word processor with heading structure intact.

Test each file where it will live

Open the PDF page by page, load the EPUB in a real reader app and sweep the font sizes, and open the DOCX in Word or Google Docs to confirm styles survived.

This diagram mirrors the product steps above so the guide remains usable even when the interface evolves.

01
Finish the project once
Write, edit and design the book in Book Studio without committing to a format. Structure — real chapters, headings and image placement — is what makes every later export clean.
02
Open the Export dialog
Use the Export button in the editor header or the Export book icon in your Library. The five format cards — PDF, KDP, EPUB, DOCX, Audio — sit beside a summary of chapters, words and estimated pages.
03
Export PDF for fixed-layout jobs
Choose PDF (free on every plan), pick a page size — Trade 6" × 9" for book-like output, US Letter or A4 for worksheets — and set the table of contents, copyright and author-page toggles before downloading.
04
Export EPUB for stores and e-readers
Choose EPUB on a paid plan for Kindle and other retailers. The output is reflowable: readers control font size and the text adapts to any screen.
05
Export DOCX for editing handoffs
Choose DOCX when a human editor, translator or co-author continues the work in a word processor with heading structure intact.
06
Test each file where it will live
Open the PDF page by page, load the EPUB in a real reader app and sweep the font sizes, and open the DOCX in Word or Google Docs to confirm styles survived.

Every step above describes the current Automateed interface — open a free preview and follow along with your own project.

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The full guide

Reflowable EPUB vs fixed-layout PDF: the real difference

A PDF is a stack of finished pages; an EPUB is a stream of structured text that each device lays out on the fly. That single difference decides everything downstream: page numbers exist in PDF but are meaningless in EPUB; a two-column worksheet survives in PDF and collapses in EPUB; a novel reads beautifully reflowed and feels rigid as fixed pages on a phone.

Choose by reading context. Screens smaller than the page favor EPUB. Content whose meaning depends on placement — forms, planners, illustrated spreads — needs PDF. Long prose intended for e-readers is EPUB by default.

What Kindle and major stores actually accept

Modern Kindle publishing runs on EPUB uploads — Amazon converts internally to its own delivery format — and most other retailers take EPUB natively. Stores validate structure: a working table of contents, a proper cover image and clean chapter markup are what pass review, which is why exporting from a structured project beats converting a designed PDF.

Retailer rules change over time, so before a store upload, skim the current file requirements rather than trusting an older tutorial — including this one’s specifics.

Why DOCX still matters in an ebook workflow

DOCX is the collaboration format: editors track changes in it, translators work in it, and many publishing services request it. An export with real heading styles lets the next person navigate and restyle the manuscript instead of fighting flattened text. Treat DOCX as the “work continues elsewhere” output — never as the file readers receive.

Keeping one source of truth across formats

The classic multi-format failure is divergence: a typo fixed in the PDF but not the EPUB, an old cover in one store. The cure is procedural — edit only the source project, re-export every affected format after each change, and date your files. Automateed regenerates every export from the current project state, which makes the source-of-truth discipline automatic as long as you re-export after edits.

Decisions that change the result

Decide by the layout contract: does your meaning depend on fixed placement?

A useful way to choose formats is to ask: “If a reader changes the font size, does my content still behave correctly?” Reflowable EPUB assumes the layout can flex. That’s ideal for novels, guides, and most nonfiction where headings, paragraphs, and inline emphasis carry the meaning.

Fixed-layout PDF assumes the layout stays put. That’s the right contract for anything where placement is part of the instruction: annotated screenshots that must remain aligned to labels, step-by-step worksheets where blank space matters, and pages designed to match a print-friendly grid. In these cases, reflow can cause text to overlap margins, push labels off their intended positions, or break multi-column compositions into confusing sequences.」「

Use structure, not hacks: what makes exports look professional across devices

Across formats, exports only hold up when the source project contains real structure: chapter headings, consistent heading levels, and images placed intentionally within those sections. When your content is structured, EPUB can build navigation and PDF can map a table of contents without relying on brittle manual page numbering.

Avoid “layout hacks” that only work in one view. For example, spacing paragraphs with repeated line breaks often looks fine inside the editor, but behaves unpredictably in EPUB because the reader recomposes the text flow. Similarly, embedding essential information as an image-only callout can keep placement stable in PDF, but removes it from EPUB reflow and can make text harder to search or enlarge. Use images for visuals, and keep instructional text as text when you can.

Resolution and image strategy: why the same picture won’t behave the same way

In PDF, image resolution is judged against a fixed canvas. If a worksheet needs crisp checkboxes, callouts, or diagram labels, you generally need images that won’t turn soft when printed at the target size. In EPUB, that same image can be scaled up or down by the reader device and can look different depending on screen density.

A practical workflow is to export once, then review the image-heavy chapters. If an EPUB looks too small or blurry, check whether images were inserted as text-wrapping figures versus flattened placements. If a PDF looks jagged or fuzzy, compare the PDF view at typical zoom levels to what you expect for print or screen use. The goal isn’t perfection at every zoom, it’s usable clarity at the reader’s normal reading scale.

Worked example

Worked example: exporting one book as (1) EPUB for stores and (2) PDF for a worksheet download

You’re publishing a short workbook-style guide called “Focus Reset.” It has: a cover, 6 chapters, several pages that include checklists and labeled diagrams, and a chapter-by-chapter TOC you want readers to use.

01
Prepare the source project for both layouts
In Book Studio, keep each chapter as a real chapter section with a heading. Put the checklist instructions as text paragraphs under the relevant heading, and keep the blank spaces as intentional layout blocks. For labeled diagrams, insert them as images near the instructions they belong to rather than as a detached block at the very top of the document.
02
Export EPUB for store reading
Export EPUB for reflowable reading. In the EPUB output, verify the table of contents uses the chapter structure (so readers can jump chapter-to-chapter). Then open the EPUB in a real reader app and test: (a) the smallest comfortable font size, (b) a larger font size, and (c) landscape orientation on a phone if you expect mobile readers. Your success check is whether the checklists remain understandable and whether diagram captions still read in the correct order.
03
Export PDF for a fixed worksheet download
Export PDF with a page size that matches your intended download/printing scenario. For a workbook, choose a template that preserves margins and spacing for the checklists and diagrams. Confirm that the table of contents points to the right starting points in the PDF. Then go page-by-page through the worksheet sections and look for the typical fixed-layout failures: cut-off elements at the bottom margin, captions that drift away from their diagram, or inconsistent header/footer behavior from one export cycle to the next.
04
Regenerate after the first edits
After you notice one small improvement (for example, renaming a chapter heading or correcting a label), do not edit exported files. Return to the source project, make the change once, then re-export both EPUB and PDF. When both outputs update from the same structured project, you avoid the common “PDF says the new heading, EPUB still shows the old one” problem that makes users question which file is current.

In this example, EPUB is chosen because readers benefit from reflowable navigation and adjustable reading comfort, while PDF is chosen because the workbook’s instructional placement and blank spaces need to stay predictable.

Avoidable mistakes

What usually breaks this workflow

Choosing EPUB because it’s “the ebook format,” then discovering the workbook sections break

Reflowable output is not automatically compatible with layouts that rely on exact placement. If your workbook contains forms, diagrams, or multi-column structures where alignment is part of comprehension, you’ll likely need fixed-layout PDF for that portion of the experience (or a redesign into reflow-friendly text).

Converting a finished PDF into EPUB

Conversion rarely recreates the semantic structure EPUB requires for navigation and reflow. The result is often a file that displays but doesn’t navigate correctly, loses heading hierarchy, or turns fine print into unreadable text. Export EPUB from the structured source instead of converting a fixed page file.

Leaving essential instructions as image-only content

Images preserve visual placement in PDF but remove the text layer that EPUB readers can reflow, search, and resize. When instructions are image-only, EPUB can become harder to use on smaller screens because the user can’t enlarge the text without scaling the entire visual.

Testing with only a file viewer

Some desktop file viewers don’t reflect the behavior of real readers. Verify EPUB in an actual reader application and verify PDF in a typical reader workflow (including typical zoom and device sizes) so you catch TOC behavior, reflow order, and margin cut-offs before sharing.

Keep the workflow moving

What to verify before acting on ebook formats

Run these checks against the actual manuscript, files and reader journey before publishing.

Text reflows correctly

Images keep useful resolution

Links and TOC work

Files open on real devices

Continue the exact workflow

Tools and guides that belong after ebook formats

Converting Kindle To Epub Ebook Examples Pdf Choose Pdf Template Ebook Export Publishing Download Epub Kdp Formatting Text To Pdf Conversion How Many Pages Is 20 000 Words

Editorial note

What this guide does and does not prove

This page is a practical workflow, not a promise of sales, ranking, publishing approval or a specific reader outcome. Platform rules and professional requirements should be checked at the point of use.

Questions specific to Ebook Formats

Before you start

Which ebook format should I use for Amazon?

Export the EPUB, or use the KDP package which includes it. Amazon’s modern upload flow accepts EPUB for ebooks; PDF is for the print interior.

Is PDF or EPUB better for a lead magnet?

PDF. Lead magnets are delivered as downloads, read once and often printed; fixed layout keeps your branding and structure intact everywhere.

Can I convert a PDF into an EPUB?

Avoid it. Reflowable output needs semantic structure that a designed PDF has already discarded. Export EPUB from the source project instead — that is why Automateed keeps both behind one dialog.

Do page numbers exist in EPUB?

Not meaningfully — the “page” changes with every font size and screen. Navigation in EPUB is the table of contents and chapter structure, so make sure both are enabled and tested.

What page sizes can Automateed PDFs use?

Print-standard options including Trade 6" × 9" (flagged for KDP), Pocket 5" × 8", Digest 5.5" × 8.5", Workbook 7" × 10", Large 8" × 10", US Letter, A4, A5 and B5.

Which formats are free to export?

PDF export is available on every plan including free. EPUB, DOCX, the KDP package and audiobook output are included with paid plans.

How do I test an EPUB properly?

Open it in an actual reader app, not just a file viewer: check the table of contents links, cover display, image placement and reflow at the smallest and largest font sizes.

Do images work differently across formats?

Yes. PDF keeps exact placement and print-level resolution needs; EPUB positions images in the text flow and scales them per device. Check image-heavy chapters in both outputs.

What format do editors want?

DOCX with heading styles intact. It preserves structure for track-changes workflows, then you bring the edited text back into the project and re-export the reader-facing formats.

Can one book be sold in multiple formats at once?

Yes, and it should be: EPUB in stores, PDF direct from your author site, print via KDP — all exported from the same project so content never diverges.

How do I know whether my content is “reflow-safe” for EPUB before exporting?

Do a structured preview test in your source project: look for content that depends on exact line wrapping, repeated manual line breaks, or multi-column positioning that must stay aligned. If the meaning would be lost when paragraphs rewrap, treat those sections as candidates for fixed-layout PDF or restructure them into normal text + images with captions.

Should I include a table of contents in both EPUB and PDF?

Yes, and they should serve the way each format works. In EPUB, the TOC should map to chapter structure so navigation links work in reflowed text. In PDF, the TOC should point to the correct page locations in the fixed document. You’ll get the best results when you build the TOC from headings in the source project rather than trying to hand-place links.

Explore next

Use your own topic

Test the “Match format to reading context” direction with a free preview.

Review the outline, visual direction and available chapters before deciding whether to continue the full project.