How do I convert PDF to EPUB in Calibre?

1. Open Calibre and click Add books → select your PDF. 2. Right-click the book → Convert books → Convert individually. 3. Set Output format to EPUB in the top-right dropdown. 4. Click OK and wait. The EPUB appears in your Calibre library. Right-click → Open containing folder to find the .epub file. Works on Windows, Mac, and Linux.

Is Calibre good for PDF to EPUB conversion?

Calibre works well for simple PDFs with clean single-column text. It struggles with multi-column layouts (academic papers, magazines), PDFs with complex tables, and scanned PDFs. For complex documents, toolkit.bot produces better output — it uses dedicated layout analysis that handles multi-column text, tables, footnotes, and OCR for scanned documents.

What Calibre settings give the best PDF to EPUB output?

In the Convert dialog: under Look & Feel, check 'Remove spacing between paragraphs'. Under Structure Detection, set 'Chapter mark' to pagebreak if chapters aren't detected. Under Search & Replace, add rules to fix common OCR artifacts. Use the Heuristic Processing tab to enable 'Enable heuristic processing' for scanned PDFs. Test the output in a reading app before distribution.

Does Calibre convert scanned PDFs to EPUB?

No. Calibre cannot OCR scanned PDFs — it will produce an EPUB with embedded images rather than searchable text. For scanned PDFs, use toolkit.bot/pdf2epub, which runs OCR server-side and produces a fully searchable, reflowable EPUB with text extracted from the scanned pages.

How to Convert PDF to EPUB with Calibre — Step-by-Step Tutorial (2026)

Calibre is the most popular free ebook manager and converter. It handles PDF-to-EPUB conversion without any account or cloud upload. Here is the complete tutorial, plus an honest assessment of when it works well and when it doesn't.

Step 1: Download and install Calibre

Calibre is free and open source, available for Windows, Mac, and Linux.

Go to calibre-ebook.com/download
Download the installer for your operating system
Run the installer — accepts all defaults
Launch Calibre — it opens to a library view

Step 2: Add your PDF to Calibre

Click Add books (top-left button) or drag your PDF into the Calibre window
The PDF appears in your library list
Click the book to select it

Step 3: Open the conversion dialog

Right-click the book → Convert books → Convert individually
Or select the book and click the Convert books button in the toolbar
The conversion dialog opens with many settings tabs

Step 4: Set output format to EPUB

In the top-right corner of the dialog, find the Output format dropdown
Select EPUB

Step 5: Key settings to adjust

Look & Feel tab

Font size: set a base font size (12pt is a good default)
Line height: 130% improves readability on e-readers
Margin: left/right margins of 2–5% are comfortable

Structure Detection tab

If Calibre doesn't detect chapters correctly, you can write an XPath expression to detect chapter headings manually — usually not needed for simple documents

Table of Contents tab

Set Force use of auto-generated Table of Contents if the source PDF has no TOC structure — Calibre will try to detect headings

Step 6: Run the conversion

Click OK — conversion typically takes 5–30 seconds
A spinning icon appears in the bottom-right corner of Calibre while it runs
When done, a new EPUB entry appears in your library (or the existing entry gains an EPUB format)

Step 7: Find and use the output file

Right-click the book → Open containing folder to find the .epub file
The file is in your Calibre library folder (default: ~/Calibre Library/Author/Title/)
Copy the .epub to your e-reader or reading app

When Calibre works well

Single-column text documents: novels, reports, simple ebooks
PDFs with embedded, selectable text (not scanned)
Documents where you have the original Word/DOCX — converting DOCX to EPUB via Calibre is more reliable than PDF

When Calibre struggles with PDFs

PDF is a page-description format, not a semantic document format. Calibre has to reverse-engineer the reading order from positioned text objects. This breaks down for:

Two-column academic papers — text from left and right columns gets interleaved
Scanned PDFs — Calibre has no OCR; scanned pages become blank in the output
Complex tables — often convert to garbled text or disappear
Footnotes and endnotes — frequently end up in the wrong position
Headers, footers, and page numbers — often included in the text flow

For these document types, a dedicated converter with academic layout detection and OCR gets significantly better results. See Calibre vs toolkit.bot comparison →

Have a complex PDF? Try the dedicated converter — handles two-column papers and scanned docs.

Convert PDF to EPUB →