How to Convert Research Papers (PDF) to EPUB for E-Readers — and Where to Get the PDF

Academic PDFs are notoriously bad on e-readers. Two-column layouts, inline citations, footnotes, and small-font figures all break when you try to zoom or reflow. Here's where to find the full-text PDF legally — whichever database, repository or search engine you start from — and how to get a clean, readable EPUB from any journal article, preprint, or working paper in under a minute, free.

Why academic PDFs fail on e-readers

• Two-column layout — PDF viewers pan horizontally; e-readers can't reflow two columns correctly
• Fixed font size — zoom doesn't help because the layout re-renders at the same scale
• Footnotes cut at page breaks — often split across pages, losing context
• Figures and captions — placed by the typesetter, not logical reading order
• Hyphenation artifacts — PDF text extraction produces "hy-phenated" words mid-sentence

How toolkit.bot handles these problems

• Two-column detection — automatically identifies multi-column regions and reflows as single-column text
• De-hyphenation — merges hyphenated word splits from PDF extraction back into whole words
• Footnote grouping — footnotes are collected per section and rendered at the end of that section
• Figure placement — figures are anchored near their reference in the text
• OCR fallback — if a page has no extractable text (scanned section), OCR is applied automatically

Where to get the PDF

Most academic databases are indexes: they tell you a paper exists and link out to wherever the full text lives. The conversion step is identical whichever source you start from, so the only question is how to reach the PDF. Whether a specific article is free varies by article; when a source shows no PDF, work through the free routes at the end of the table.

If none of these turn up a PDF: search the paper title in Google Scholar and Semantic Scholar, look for it on the author's university page, request it by interlibrary loan, or email the corresponding author. Reference managers help at scale — Scopus, Web of Science and Embase export RIS or BibTeX straight into Zotero, Mendeley or EndNote, and Unpaywall runs as you browse the results.

Step-by-step: convert an arXiv paper

1. Download the PDF from arXiv (click Download PDF on the abstract page)
2. Go to toolkit.bot/pdf2epub
3. Upload the PDF — conversion takes 20–60 seconds for typical papers
4. Download the EPUB and load it onto your e-reader

arXiv papers are the most common use case — two-column LaTeX, equations as images, figure captions. Our converter handles these reliably. Full arXiv guide →

Journal articles (publisher PDFs)

Publisher PDFs from Springer, Elsevier, and IEEE often have more complex layouts — sidebars, pull quotes, watermarks. Watermarks are removed during extraction; sidebars are treated as separate text blocks. Results are generally good for text-heavy papers; figures-heavy layout articles may have positioning artifacts. Long structured documents — Cochrane reviews, dissertations, ERIC reports — convert especially well because their headings become chapter navigation; forest plots and statistical tables come through as images. Publisher-by-publisher notes are in the journal and publisher guide.

Why Calibre fails on academic PDFs

Calibre's PDF engine does not detect two-column layouts — it reads columns left-to-right across the full page width, producing garbled text where column 1 line 1 is followed by column 2 line 1. For any paper with two columns, use toolkit.bot. Calibre vs toolkit.bot comparison →

Batch converting a reading list

If you have a folder of papers to convert, use the shell script approach:

for f in papers/*.pdf; do
  curl -sX POST https://toolkit.bot/convert     -F "file=@$f"     -o "${f%.pdf}.epub"
  sleep 2
done

See the full batch conversion guide → for Python and Windows variants.

Loading papers onto your e-reader

Kindle

Email to your @kindle.com address (no file size limit for recent Kindle models). Kindle guide →

Kobo

Drag to the Kobo drive via USB, or use Kobo's Send to Kobo email. Kobo guide →

iPad

Open in Safari → share to Apple Books. iPad guide →

reMarkable

Upload through the reMarkable desktop or mobile app, or email the EPUB to your device address. Handwritten margin notes export as a PDF with the annotations overlaid.

BOOX and PocketBook

USB, BOOX Cloud or the device email address on BOOX; USB, PocketBook Cloud or Send to PocketBook email on PocketBook. On BOOX, KOReader exports highlights to text or CSV for Obsidian, Zotero or Notion.

Reading and annotating

Kindle highlights sync to your Amazon account and export via Readwise or the highlights page; Kobo highlights export through Calibre or the Kobo app. For papers whose figures are the point — microscopy, circuit diagrams, data visualisations — keep the original PDF alongside the EPUB; figures in the EPUB tap to zoom but stay images. A 7–8 inch screen is noticeably better than 6 inches for figure-heavy papers, and Calibre can manage a large paper library and sync it to Kobo or BOOX over USB or Wi-Fi.

Related guides

• How to read arXiv papers on Kindle (EPUB method)
• How to batch convert multiple PDFs to EPUB
• Convert scanned PDFs to EPUB with automatic OCR
• Why Calibre fails on academic PDFs (and what to use instead)