Why do PDFs read so badly on most e-readers?

Because a PDF is fixed-layout: it has a set page size with text locked in position, designed to look identical on any screen or in print. On a six-inch e-reader that means you see a whole shrunken page (tiny text) or zoom in and pan around line by line — the text cannot reflow to fit the screen or your chosen font size. E-readers are built around reflowable formats like ePub, where text rewraps to the device. So a PDF on an e-reader fights the device's entire design. The fix is either to convert the PDF to a reflowable format, or, when the fixed layout matters, to optimise the PDF specifically for the device's screen size.

What is the single best way to make a document read well on any e-reader?

Convert it to ePub, the reflowable format e-readers are designed around. ePub text rewraps to any screen and any font size, which is exactly what makes a long document comfortable on a small device. Modern Kindles accept ePub (Amazon converts it on ingest via Send to Kindle), and Kobo, Apple Books, and essentially every other current reader treat ePub as native. So a single ePub is the most portable, comfortable choice across devices. Keep the PDF for printing or for documents whose exact layout matters, but for reading on e-readers, ePub is the answer for the great majority of text-led content.

When should I keep the PDF instead of converting?

Keep the PDF when the exact layout is the point: anything to be printed, forms, image-led or heavily-designed documents, comics or art books, and material with precise tables that would scramble in reflow. For these, a reflowable conversion does more harm than good. The move then is to optimise the PDF for the device rather than convert it — set the page size close to the e-reader's screen so there is less zooming, embed fonts, and compress so it loads and turns pages quickly. Some e-ink devices (notetakers like reMarkable) are PDF-first anyway and handle a well-sized PDF well.

How do I optimise a PDF for a small e-reader screen?

Three moves. First, page size: a document-sized page (A4/Letter) is far bigger than a six-inch screen, so resizing the pages closer to the device's aspect ratio reduces the zoom-and-pan misery. Second, embed fonts so text renders correctly on a device that does not have your typeface. Third, compress, especially if the PDF is image-heavy, so pages load and turn without lag on modest e-reader hardware. You will not get true reflow this way — that requires ePub — but a right-sized, font-embedded, compressed PDF is dramatically more readable on an e-reader than a raw document-sized one.

Does converting to ePub keep my images and formatting?

Basic formatting and images carry over in a good conversion, but how faithfully depends on the source. Simple, single-column, text-led documents convert cleanly. Complex layouts, multi-column pages, and heavy designs convert roughly — images may shift and reading order can scramble — because fixed positioning has to become flowing content. For image-led books, a fixed-layout ePub or keeping the PDF preserves the design better than a reflowable conversion. Verify the result on a real device, paging through the whole thing, before you rely on it. Match the format to the content: reflowable ePub for text, fixed layout or PDF for design.

Can I get a scanned PDF to read well on an e-reader?

A scan is page images with no text, so it has the worst of both worlds on an e-reader: it cannot reflow (no text) and the page images are sized for paper, not a small screen. To make it readable, either OCR it and convert to ePub so the recognised text reflows (verify the OCR), or, if you want to keep the scanned look, crop and resize the page images closer to the screen size and compress. For a scanned book you actually want to read on a small device, the OCR-to-ePub route, with proofreading, gives by far the better reading experience.

Is it safe to convert or optimise a confidential document online?

Unpublished or licensed content is sensitive, so prefer a tool that processes files locally, and only convert content you have the right to. ScoutMyTool converts to ePub and optimises PDFs (resize, embed fonts, compress) entirely in your browser tab, so the document never leaves your machine. For anything you would not publish openly, confirm the tool does not upload before using it.

6 min read

How to make a PDF work on all e-readers

By ScoutMyTool Editorial Team · Last updated: 2026-05-22

I gave my dad a Kindle and a folder of PDFs to read on it, and within a day he handed it back: “the words are too small and I keep losing my place.” He was not doing anything wrong — PDFs and e-readers are a genuinely bad match, because a PDF is a fixed page and an e-reader wants flowing text it can resize. The good news is there are two clean fixes depending on the document: convert text-led PDFs to reflowable ePub, or, when the layout must stay fixed, optimise the PDF for the device’s screen. This guide explains why the mismatch happens, which fix to use when, and how to make a document genuinely comfortable to read on Kindle, Kobo, and the rest.

What different e-readers prefer

Device	PDF support	Best format
Kindle (modern)	Opens PDFs; reflow limited	ePub via Send to Kindle for reflow
Kobo	Native PDF + ePub	ePub for text; PDF for fixed layout
Apple Books	Good PDF + ePub	Either; ePub reflows
reMarkable / e-ink notetakers	PDF-first	PDF, sized to the screen
Phone / tablet apps	Good	ePub for reading; PDF for layout
Older / basic e-readers	Poor PDF reflow	ePub strongly preferred

Step by step — make it read well anywhere

Decide convert vs. optimise. Text-led document (novel, report, essay)? Convert to ePub for reflow. Layout matters (forms, design, tables)? Keep the PDF and optimise it.
For reflow, convert to ePub. Run PDF to ePub — works across Kindle (via Send to Kindle), Kobo, Apple Books. See PDF to ePub and, for figures, keeping images intact.
OCR scans before converting. A scanned PDF has no text to reflow; OCR it first, then convert, and verify the recognised text.
To keep the PDF, resize the pages. Bring a document-sized page closer to the e-reader screen with Resize PDF Pages to cut zoom-and-pan; see mobile-friendly PDFs.
Embed fonts. Confirm with Font Embedding Check so text renders right on a device without your typeface — see PDF compatibility.
Compress for snappy page turns. Compress image-heavy PDFs so modest e-reader hardware loads and turns pages without lag.
Test on the actual device. Side-load and read a few pages at your chosen font size; confirm it is comfortable before committing a whole library.

PDF eBook to ePub: the reflow conversion in depth.
PDF to ePub with images: keeping figures intact.
Mobile-friendly PDFs: optimising for small screens.
PDF compatibility: fonts and standards across readers.
eBook to PDF: the reverse, for print.
PDF to ePub tool: convert in your browser.
All ScoutMyTool PDF tools: the full toolkit.

FAQ

Why do PDFs read so badly on most e-readers?: Because a PDF is fixed-layout: it has a set page size with text locked in position, designed to look identical on any screen or in print. On a six-inch e-reader that means you see a whole shrunken page (tiny text) or zoom in and pan around line by line — the text cannot reflow to fit the screen or your chosen font size. E-readers are built around reflowable formats like ePub, where text rewraps to the device. So a PDF on an e-reader fights the device's entire design. The fix is either to convert the PDF to a reflowable format, or, when the fixed layout matters, to optimise the PDF specifically for the device's screen size.
What is the single best way to make a document read well on any e-reader?: Convert it to ePub, the reflowable format e-readers are designed around. ePub text rewraps to any screen and any font size, which is exactly what makes a long document comfortable on a small device. Modern Kindles accept ePub (Amazon converts it on ingest via Send to Kindle), and Kobo, Apple Books, and essentially every other current reader treat ePub as native. So a single ePub is the most portable, comfortable choice across devices. Keep the PDF for printing or for documents whose exact layout matters, but for reading on e-readers, ePub is the answer for the great majority of text-led content.
When should I keep the PDF instead of converting?: Keep the PDF when the exact layout is the point: anything to be printed, forms, image-led or heavily-designed documents, comics or art books, and material with precise tables that would scramble in reflow. For these, a reflowable conversion does more harm than good. The move then is to optimise the PDF for the device rather than convert it — set the page size close to the e-reader's screen so there is less zooming, embed fonts, and compress so it loads and turns pages quickly. Some e-ink devices (notetakers like reMarkable) are PDF-first anyway and handle a well-sized PDF well.
How do I optimise a PDF for a small e-reader screen?: Three moves. First, page size: a document-sized page (A4/Letter) is far bigger than a six-inch screen, so resizing the pages closer to the device's aspect ratio reduces the zoom-and-pan misery. Second, embed fonts so text renders correctly on a device that does not have your typeface. Third, compress, especially if the PDF is image-heavy, so pages load and turn without lag on modest e-reader hardware. You will not get true reflow this way — that requires ePub — but a right-sized, font-embedded, compressed PDF is dramatically more readable on an e-reader than a raw document-sized one.
Does converting to ePub keep my images and formatting?: Basic formatting and images carry over in a good conversion, but how faithfully depends on the source. Simple, single-column, text-led documents convert cleanly. Complex layouts, multi-column pages, and heavy designs convert roughly — images may shift and reading order can scramble — because fixed positioning has to become flowing content. For image-led books, a fixed-layout ePub or keeping the PDF preserves the design better than a reflowable conversion. Verify the result on a real device, paging through the whole thing, before you rely on it. Match the format to the content: reflowable ePub for text, fixed layout or PDF for design.
Can I get a scanned PDF to read well on an e-reader?: A scan is page images with no text, so it has the worst of both worlds on an e-reader: it cannot reflow (no text) and the page images are sized for paper, not a small screen. To make it readable, either OCR it and convert to ePub so the recognised text reflows (verify the OCR), or, if you want to keep the scanned look, crop and resize the page images closer to the screen size and compress. For a scanned book you actually want to read on a small device, the OCR-to-ePub route, with proofreading, gives by far the better reading experience.
Is it safe to convert or optimise a confidential document online?: Unpublished or licensed content is sensitive, so prefer a tool that processes files locally, and only convert content you have the right to. ScoutMyTool converts to ePub and optimises PDFs (resize, embed fonts, compress) entirely in your browser tab, so the document never leaves your machine. For anything you would not publish openly, confirm the tool does not upload before using it.

Citations

Wikipedia — “EPUB,” the reflowable e-book standard e-readers are built around. en.wikipedia.org/wiki/EPUB
Wikipedia — “Comparison of e-book formats,” how PDF, ePub, and Kindle formats differ on devices. en.wikipedia.org — e-book formats
Wikipedia — “PDF” (ISO 32000), the fixed-layout format and why it does not reflow. en.wikipedia.org/wiki/PDF

Read it comfortably on any device

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