Why does a PDF read so badly on a Kindle or phone?

A PDF is fixed-layout: every page is a fixed size with text and images locked in absolute positions, designed to look identical whether printed or on screen. That is perfect for a form or a print document, but on a small e-reader screen it means you either see a tiny full page or zoom in and pan around line by line — the text cannot reflow to fit. ePub is the opposite: it is reflowable, so the text rewraps to whatever screen and font size the reader chooses, like a web page. Converting PDF to ePub is really about converting a fixed page into flowing text that an e-reader can lay out comfortably.

Will the conversion be perfect?

It depends heavily on the source. A PDF that is mostly single-column prose — a novel, a report, an essay — converts well, because the text extracts cleanly and reflows naturally. A PDF with complex multi-column layouts, heavy formatting, sidebars, footnotes, or lots of tables converts roughly: reading order can get scrambled, tables may break, and you will need cleanup. Scanned PDFs (images of pages) have no text to reflow at all and must be OCR'd first, with the usual accuracy caveats. Set expectations by the source: simple prose, near-automatic; complex design, expect to fix the result before it is shelf-ready.

What happens to images, footnotes, and tables?

In a reflowable ePub, images become inline elements that flow with the surrounding text rather than sitting at a fixed spot, so a figure may move relative to the paragraph that references it — usually fine, occasionally worth repositioning. Footnotes ideally convert to linked endnotes or popup notes, but a naive conversion can dump them inline mid-paragraph, which needs tidying. Tables are the hardest: a wide print table does not fit a phone screen and may need simplifying or turning into an image. For text-heavy books these issues are minor; for reference works full of tables, ePub may not be the right target at all.

Should I convert to ePub or just keep the PDF?

Match the format to the content and the device. Keep the PDF when exact layout matters — anything to be printed, forms, image-heavy or design-led documents, or reference material with precise tables. Convert to ePub when the content is long-form reading meant for an e-reader or phone, where adjustable text size and reflow make the difference between comfortable and miserable. Many people keep both: the PDF as the canonical, printable copy and an ePub for actually reading on the couch. The conversion does not destroy the original — you are making a reading-optimised companion.

Can I convert a scanned-image PDF eBook to ePub?

Not directly — a scanned PDF is pictures of pages with no underlying text, and ePub needs real text to reflow. Run OCR first to add a text layer, then convert. Expect to proofread: OCR misreads, especially of older books, hyphenation at line ends, and running headers/footers that get mixed into the body. For a scanned book you care about, budget time to clean the OCR text after conversion, or the ePub will carry every recognition error into your reading. For a clean born-digital PDF, no OCR is needed.

What about Kindle specifically — does it take ePub?

Modern Kindle devices and apps accept ePub (Amazon converts it on ingest via Send to Kindle), so ePub is a good universal target. Historically Kindle used its own formats (MOBI/AZW), and you may still see those mentioned, but for getting a converted book onto a current Kindle, ePub works. For Kobo, Apple Books, and most other readers, ePub is the native format. So converting PDF to ePub gives you a single file that works across essentially all current e-readers — more portable than chasing device-specific formats.

Is it safe to convert a personal or purchased eBook online?

Convert only books you own or have the right to convert, and respect any DRM and licensing — this article is about format conversion of your own files, not circumventing protections. For privacy, prefer a tool that processes the file locally. ScoutMyTool runs its PDF-to-ePub conversion in your browser tab, so your book never leaves your machine. For any file you would not share publicly, confirm the tool does not upload before converting.

6 min read

How to convert a PDF eBook to ePub for e-readers

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

I bought a long technical book as a PDF and tried to read it on my e-reader, and it was torture: a full A4 page shrunk to a six-inch screen, so I either squinted at a whole page or zoomed in and dragged the view across every line. The book was fine; the format was wrong for the device. Converting it to ePub fixed everything — the text reflowed to my screen, I set the font size I wanted, and it finally read like a book. This guide explains that conversion: why fixed-layout PDFs read badly on e-readers, what converts cleanly and what does not, how images, footnotes, and tables behave, and how to check the result before you settle in to read.

PDF vs. ePub — fixed vs. reflowable

The core difference is layout model: PDF fixes everything in place; ePub lets text flow. That single distinction drives which format suits which content and device.

Aspect	PDF	ePub
Layout	Fixed — fixed page size	Reflowable — adapts to screen
Font size	Fixed; zoom only	Reader-adjustable
Small screens	Pinch and pan	Text reflows to fit
Best content	Forms, print, exact layout	Long-form prose, novels
Images/tables	Always placed exactly	Flow with text; complex tables struggle
E-reader support	Readable but awkward	Native on Kobo, Kindle, Apple Books

Step by step — convert a PDF eBook to ePub

Check the source type. Is it born-digital (selectable text) or a scan (images)? Is it single-column prose or a complex multi-column/table-heavy layout? That determines how clean the conversion will be.
OCR first if it is a scan. A scanned PDF has no text to reflow — run PDF OCR to add a text layer, then plan to proofread the recognised text after conversion.
Convert to ePub. Run PDF to ePub to extract the text and rebuild it as reflowable content. For a web-style reading option, you can also try PDF to flipbook/HTML.
Fix reading order and notes. Check that the text flows in the right order, footnotes read as notes rather than inline noise, and running headers/footers are not dumped into the body. Tidy anything the converter misgrouped.
Handle images and tables. Confirm figures sit sensibly near their references; simplify or imagize wide tables that will not fit a phone screen.
Embed fonts and add navigation. Keep special characters intact (see embedding fonts) and make sure the ePub has a working table of contents so readers can jump between chapters.
Test on a real device. Side-load the ePub onto your e-reader or app, change the font size, and read a few pages to confirm it reflows comfortably before you rely on it.

eBook to PDF: the reverse direction, for printing and fixed layout.
ePub to PDF for print: making a reflowable book printable.
PDF to HTML: another reflowable, web-friendly target.
Embedding fonts: keeping characters intact through conversion.
Mobile-friendly PDFs: when you would rather adapt the PDF.
PDF to ePub tool: convert in your browser.
All ScoutMyTool PDF tools: the full toolkit.

FAQ

Why does a PDF read so badly on a Kindle or phone?: A PDF is fixed-layout: every page is a fixed size with text and images locked in absolute positions, designed to look identical whether printed or on screen. That is perfect for a form or a print document, but on a small e-reader screen it means you either see a tiny full page or zoom in and pan around line by line — the text cannot reflow to fit. ePub is the opposite: it is reflowable, so the text rewraps to whatever screen and font size the reader chooses, like a web page. Converting PDF to ePub is really about converting a fixed page into flowing text that an e-reader can lay out comfortably.
Will the conversion be perfect?: It depends heavily on the source. A PDF that is mostly single-column prose — a novel, a report, an essay — converts well, because the text extracts cleanly and reflows naturally. A PDF with complex multi-column layouts, heavy formatting, sidebars, footnotes, or lots of tables converts roughly: reading order can get scrambled, tables may break, and you will need cleanup. Scanned PDFs (images of pages) have no text to reflow at all and must be OCR'd first, with the usual accuracy caveats. Set expectations by the source: simple prose, near-automatic; complex design, expect to fix the result before it is shelf-ready.
What happens to images, footnotes, and tables?: In a reflowable ePub, images become inline elements that flow with the surrounding text rather than sitting at a fixed spot, so a figure may move relative to the paragraph that references it — usually fine, occasionally worth repositioning. Footnotes ideally convert to linked endnotes or popup notes, but a naive conversion can dump them inline mid-paragraph, which needs tidying. Tables are the hardest: a wide print table does not fit a phone screen and may need simplifying or turning into an image. For text-heavy books these issues are minor; for reference works full of tables, ePub may not be the right target at all.
Should I convert to ePub or just keep the PDF?: Match the format to the content and the device. Keep the PDF when exact layout matters — anything to be printed, forms, image-heavy or design-led documents, or reference material with precise tables. Convert to ePub when the content is long-form reading meant for an e-reader or phone, where adjustable text size and reflow make the difference between comfortable and miserable. Many people keep both: the PDF as the canonical, printable copy and an ePub for actually reading on the couch. The conversion does not destroy the original — you are making a reading-optimised companion.
Can I convert a scanned-image PDF eBook to ePub?: Not directly — a scanned PDF is pictures of pages with no underlying text, and ePub needs real text to reflow. Run OCR first to add a text layer, then convert. Expect to proofread: OCR misreads, especially of older books, hyphenation at line ends, and running headers/footers that get mixed into the body. For a scanned book you care about, budget time to clean the OCR text after conversion, or the ePub will carry every recognition error into your reading. For a clean born-digital PDF, no OCR is needed.
What about Kindle specifically — does it take ePub?: Modern Kindle devices and apps accept ePub (Amazon converts it on ingest via Send to Kindle), so ePub is a good universal target. Historically Kindle used its own formats (MOBI/AZW), and you may still see those mentioned, but for getting a converted book onto a current Kindle, ePub works. For Kobo, Apple Books, and most other readers, ePub is the native format. So converting PDF to ePub gives you a single file that works across essentially all current e-readers — more portable than chasing device-specific formats.
Is it safe to convert a personal or purchased eBook online?: Convert only books you own or have the right to convert, and respect any DRM and licensing — this article is about format conversion of your own files, not circumventing protections. For privacy, prefer a tool that processes the file locally. ScoutMyTool runs its PDF-to-ePub conversion in your browser tab, so your book never leaves your machine. For any file you would not share publicly, confirm the tool does not upload before converting.

Citations

Wikipedia — “EPUB,” the reflowable, open e-book standard (W3C/IDPF). en.wikipedia.org/wiki/EPUB
Wikipedia — “PDF” (ISO 32000), the fixed-layout document format. en.wikipedia.org/wiki/PDF
Wikipedia — “Comparison of e-book formats,” how ePub, PDF, and Kindle formats differ. en.wikipedia.org — e-book formats

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