Best Free Offline PDF to EPUB Converter for PC (2026) — 5 Desktop Tools Tested

PDF is great for printing and viewing on large screens. But for reading on an e-reader, tablet, or phone, EPUB is vastly superior — it reflows text to fit any screen size, lets you adjust font size and spacing, and typically produces files 5-10x smaller than the source PDF.

The problem? Most online PDF to EPUB converters require you to upload your file to a server. For copyrighted ebooks or sensitive documents, that is a privacy risk.

This guide tests 5 free offline PDF to EPUB converters on a Windows 10 PC with a set of test files: a text-based novel (120 pages), a scanned textbook (340 pages), and a layout-heavy magazine (48 pages).

Test Results Summary

Bottom line: Calibre for text-based PDFs, PDF24 for scanned PDFs. Both are completely free.

1. Calibre — Best Overall for Text-Based PDFs

Platform: Windows, Mac, Linux Price: Free (open source) File size: ~180MB

Calibre is the gold standard for ebook management. Its PDF to EPUB conversion handles text-based PDFs better than any other free tool.

How to Convert

1. Download and install Calibre from calibre-ebook.com
2. Drag your PDF into the Calibre library window
3. Select the book, click “Convert books”
4. Set output format to EPUB in the top-right dropdown
5. Click OK — conversion takes 10-60 seconds depending on file size

Conversion Quality

Text-based novel (120 pages):

• Text extraction: 98% accurate, occasional hyphenation errors at line breaks
• Chapter detection: Automatically detected 14 of 16 chapters
• Images: All 3 cover/illustration images preserved
• File size: 2.1MB PDF → 380KB EPUB

Scanned textbook (340 pages):

• Text extraction: Failed — output was garbled (Calibre does not have OCR)
• Recommendation: Use PDF24 Creator for scanned PDFs

Layout-heavy magazine (48 pages):

• Text extraction: 85% accurate, some multi-column text was reordered incorrectly
• Images: Preserved but repositioned
• Recommendation: Acceptable for personal reading, not for professional use

Pros and Cons

2. PDF24 Creator — Best for Scanned PDFs (OCR Support)

Platform: Windows only Price: Free File size: ~30MB

PDF24 Creator is a Swiss army knife for PDF operations. Its OCR module can extract text from scanned PDFs before converting to EPUB — making it the best choice for digitized books and scanned documents.

How to Convert

1. Download PDF24 Creator from pdf24.org
2. Open PDF24 Creator, click “Convert to EPUB”
3. Drag your PDF into the window
4. For scanned PDFs: check “Enable OCR” and select language
5. Click “Convert” — process takes 30-120 seconds

Conversion Quality

Text-based novel (120 pages):

• Text extraction: 95% accurate (slightly below Calibre)
• Images: Preserved with minor compression
• File size: 2.1MB PDF → 520KB EPUB

Scanned textbook (340 pages):

• Text extraction: 88% accurate with OCR enabled (Chinese OCR: 82%)
• Images: Preserved
• File size: 48MB PDF → 12MB EPUB
• Processing time: 4 minutes 20 seconds

Layout-heavy magazine (48 pages):

• Text extraction: 80% accurate, multi-column handling similar to Calibre
• Images: Preserved but heavily compressed

Pros and Cons

3. Pdf2ePub — Microsoft Store App

Platform: Windows 10/11 (Microsoft Store) Price: Free (5 files per batch), $15 for unlimited File size: ~50MB

Pdf2ePub is a lightweight Windows Store app focused solely on PDF to EPUB conversion. It is the easiest option for beginners who want a simple drag-and-drop interface.

Conversion Quality

• Text PDFs: Good text extraction, basic image preservation
• Scanned PDFs: Not supported (no OCR)
• Layout PDFs: Fair — simple layouts convert well, complex ones get messy

Pros and Cons

4. Coolmuster PDF to ePub Converter

Platform: Windows, Mac Price: Free trial (5 pages), $30 full version

Coolmuster is a commercial tool with a free trial. The trial converts the first 5 pages of each PDF — enough to test quality before buying.

Conversion Quality

• Text PDFs: Excellent conversion quality, preserves formatting well
• Scanned PDFs: Not supported
• Layout PDFs: Good — best layout preservation among tested tools

Verdict

Good quality but the $30 price tag is hard to justify when Calibre and PDF24 are free. Only consider if you need its specific layout preservation feature for professional publishing.

5. AnyConv Desktop

Platform: Windows Price: Free

AnyConv is primarily an online converter with a basic desktop app. The desktop version works offline but has limited features.

Conversion Quality

• Text PDFs: Fair — some formatting loss
• Scanned PDFs: Not supported
• Layout PDFs: Poor — significant layout disruption

Verdict

Only use if Calibre and PDF24 are unavailable. The conversion quality is noticeably below the other tools.

Conversion Quality Comparison

Tips for Better PDF to EPUB Conversion

1. Clean up the PDF first: Remove blank pages, fix rotated pages, and crop margins before conversion. Calibre’s PDF input plugin handles some of this automatically.

2. Check chapter detection: After conversion, open the EPUB and verify the table of contents. Calibre lets you manually edit chapter markers if auto-detection missed some.

3. Adjust metadata: Set the book title, author, and cover image in Calibre before converting. This metadata carries into the EPUB and displays correctly in e-reader apps.

4. Test with a single chapter: For large PDFs, convert just the first chapter to check quality before processing the entire file.

5. Use heuristics: Calibre’s conversion settings include “Heuristic processing” — enable this for PDFs with inconsistent formatting. It tries to detect chapter headings, fix hyphenation, and clean up formatting artifacts.

For most users, the recommendation is simple: install Calibre for text-based PDFs and PDF24 Creator for scanned PDFs. Both are free, both work offline, and together they cover virtually every PDF to EPUB conversion scenario.