Convert DOCX to EPUB Online Free
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Transform Microsoft Word documents into properly structured EPUB ebooks. Powered by Calibre for reliable conversion that preserves headings, formatting, images, and styling in a reflowable ebook format.
By ChangeThisFile Team · Last updated: March 2026
ChangeThisFile converts your Microsoft Word document (.docx) into a properly structured EPUB ebook using Calibre on our secure servers. Word headings become EPUB chapters, paragraph formatting is preserved, and images are embedded. The result is a reflowable ebook ready for Apple Books, Kobo, or any EPUB-compatible reader. Encrypted transfer with automatic file deletion after processing, completely free with no signup required.
Word Document vs EPUB: Format Comparison
Key differences between the two formats
| Feature | DOCX | EPUB |
|---|---|---|
| Format | Microsoft Word (Office Open XML) | Electronic Publication |
| Content type | Editable word processor document | Reflowable ebook |
| Structure | Heading styles, paragraphs, tables, lists | Chapters, table of contents, spine navigation |
| Formatting | Full word processor styling (fonts, colors, spacing) | Ebook-optimized CSS (fonts, text styling) |
| Images | Embedded in document package | Embedded within EPUB container |
| Page layout | Fixed page dimensions (Letter, A4) | Reflowable (adapts to screen size) |
| Compatibility | Word, Google Docs, LibreOffice | Apple Books, Kobo, Nook, most e-readers |
When to Convert
Common scenarios where this conversion is useful
Self-publish a Word manuscript
Convert your Word document into EPUB for uploading to ebook retailers like Apple Books, Kobo, Google Play Books, or Smashwords.
Distribute documents as ebooks
Transform reports, guides, or manuals written in Word into EPUB for portable reading on e-readers and tablets.
Create classroom materials
Convert Word-based course materials, reading packets, or textbook drafts into EPUB for student access on any device.
Author review copies
Convert a Word manuscript to EPUB to send advance review copies to beta readers using their preferred e-reader apps.
Who Uses This Conversion
Tailored guidance for different workflows
Authors
- Convert Word Document manuscripts to EPUB for publishing on Amazon Kindle, Apple Books, or Kobo
- Transform Word Document drafts to EPUB for sending advance review copies to beta readers
Publishers
- Convert Word Document titles to EPUB for distributing across multiple ebook retail platforms simultaneously
- Transform Word Document backlist titles to EPUB to make older catalogs available in modern formats
Readers
- Convert Word Document ebooks to EPUB for reading on your preferred e-reader device or app
- Transform Word Document books to EPUB to consolidate your library into a single compatible format
How to Convert Word Document to EPUB
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1
Upload your DOCX file
Drag and drop your .docx file onto the converter, or click to browse. Files up to 50 MB are supported for free.
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2
Server-side conversion via Calibre
Your file is securely uploaded and converted on our servers using Calibre. The converter maps Word heading styles to EPUB chapters, preserves paragraph formatting and images, builds a table of contents, and packages everything into a valid EPUB container.
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3
Download the result
Once conversion is complete, click Download to save your .epub file. The uploaded file is automatically deleted from our servers.
Developers: convert via API →
Frequently Asked Questions
Yes, completely free. Convert DOCX to EPUB with no cost, no signup, and no watermarks.
No. Files are automatically deleted immediately after conversion. Nothing is stored or retained.
Yes. Files are transferred over encrypted HTTPS connections. Your data is protected in transit.
The conversion uses Calibre, the powerful open-source ebook management tool. Calibre converts DOCX by extracting the Office Open XML content and rebuilding it as valid EPUB with proper chapter structure and navigation.
Yes. Calibre uses Heading 1 and Heading 2 styles as chapter break points and builds a table of contents from your heading hierarchy. Using consistent Word heading styles produces the best results.
Yes. Images embedded in the Word document are transferred to the EPUB container. They display inline at their original positions.
Tables and bulleted/numbered lists are converted to their HTML equivalents in the EPUB. Complex table layouts may be simplified for e-reader compatibility.
Custom fonts from the Word document are not embedded. The EPUB uses the e-reader's default font. Basic styling like bold, italic, and underline is preserved.
No. Page numbers, headers, and footers are removed since EPUB uses reflowable text without fixed pages.
Kindle does not natively support EPUB. Convert the EPUB to MOBI or AZW3 using ChangeThisFile, or use Amazon's Send to Kindle feature which accepts EPUB.
Currently, files are converted one at a time. Upload your next file after downloading the result.
Files up to 50 MB are supported for free conversion.
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Need to convert programmatically?
Use the ChangeThisFile API to convert Word Document to EPUB in your app or script. Free tier included.
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