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OpenDocument EPUB Swap

OpenDocument to EPUB

Your file never leaves this device. Conversion runs in your browser. The document itself is not uploaded.

1 · Choose a OpenDocument file

…or drop a OpenDocument file here

.odt · stays in this tab

2 · Convert

3 · Download

Choose a file to convert. It is not uploaded.

FAQ and format details
Why convert OpenDocument to EPUB?

Authors in LibreOffice who want a reader file without Calibre's full GUI. Course packs written in Writer. Better than printing ODT to PDF for phone reading, because EPUB reflows.

How this conversion runs

content.xml headings with outline-level 1 become h1. Two or more h1s split chapters. Package, nav, and CSS follow EPUB 3. Writer's 'Title' vs 'Heading 1' confusion is the usual failure mode — check outline levels in Writer first.

Keep in mind for OpenDocument → EPUB

Indexes, bibliographies, and captions in frames will not become EPUB semantics. Cover pages as first-page drawings will flatten. Kindle still wants a Calibre step for some devices.

After you have a EPUB file

Check the TOC in Thorium. If one chapter, fix outline levels in Writer (Heading 1 per chapter) and reconvert. Add metadata in Sigil for distribution.

Where do I set chapter headings in Writer?

Apply Heading 1 (outline level 1) to each chapter title, not just a larger font. Font size alone does not become h1.

Does the ODT table of contents become nav.xhtml?

No. nav.xhtml is built from h1 splits, not from Writer's TOC field.

This pair at a glance
Accepts
.odt
Writes
.epub · application/epub+zip
Read fidelity
high (OpenDocument → HTML)
Write fidelity
high (HTML → EPUB)
Source size
Plan for files under 24 MB

The file is read in this tab. It is not uploaded.

Something off with this pair? Send feedback.

About OpenDocument Text and EPUB

Source file

OpenDocument Text

The ISO text format used by LibreOffice Writer and OpenOffice: a ZIP of XML, the open counterpart to DOCX.

ODT is part of the OpenDocument family (ODS spreadsheets, ODP presentations). Governments and open-source shops standardize on it. Internally it is content.xml plus styles, metadata, and media. Conversion through HTML maps text:h / text:p / tables onto HTML equivalents.

Extensions
.odt
MIME types
application/vnd.oasis.opendocument.text
Kind
zip · binary
Category
word processing
Standard
Open format · since 2005
Comfortable size
Up to about 24 MB in this browser converter
Read into HTML
high fidelity · implemented — Reads content.xml and styles.xml: headings, lists (ul/ol), tables, strike/sub/sup, and Pictures/ as data URLs.

What this format can hold

  • headings
  • paragraphs
  • lists
  • tables
  • links
  • images
  • inline formatting
  • styles

Usually dropped on the way in

  • master styles
  • tracked changes
  • draw frames as layout
  • macros

Apps that consume OpenDocument

  • LibreOffice Writer (The Document Foundation) — creates and opens on Windows, macOS, Linux
  • Apache OpenOffice Writer (Apache) — creates and opens on Windows, macOS, Linux
  • Google Docs (Google) — creates and opens on Web
  • Microsoft Word (Microsoft) — creates and opens on Windows, macOS, Web
  • Calligra Words (KDE) — creates and opens on Linux
  • OnlyOffice — creates and opens on Windows, macOS, Linux, Web

Catalog notes

  • FODT (flat XML OpenDocument) is not yet a separate type; save as ODT first.
  • ZIP collision with DOCX/EPUB is resolved by checking mimetype or META-INF/manifest.xml.

Destination file

EPUB

The open ebook format: a ZIP of XHTML chapters, CSS, and a package manifest. What Apple Books, Google Play Books, and most non-Kindle readers consume.

EPUB 3 is HTML in a spine. That makes the HTML hub almost native: we concatenate or split XHTML documents and rewrite the OPF package. Kindle’s AZW/MOBI family is a different type and is not in this matrix.

Extensions
.epub
MIME types
application/epub+zip
Kind
zip · binary
Category
ebook
Standard
Open format · since 2007
Comfortable size
Up to about 38 MB in this browser converter
Written from HTML
high fidelity · implemented — Emits EPUB 3 with a single content document split on h1, plus nav.xhtml.

What this format can hold

  • headings
  • paragraphs
  • lists
  • links
  • images
  • inline formatting
  • chapters
  • table of contents

Usually dropped on the way out

  • multi file chapter map unless h1 split

Apps that consume EPUB

  • Apple Books (Apple) — opens on macOS, iOS
  • Google Play Books (Google) — opens on Web, Android, iOS
  • Calibre — creates and opens on Windows, macOS, Linux
  • Thorium Reader — opens on Windows, macOS, Linux
  • Foliate — opens on Linux
  • Kindle (via conversion) (Amazon) — opens on e-ink, iOS, Android
  • Sigil — creates on Windows, macOS, Linux

Catalog notes

  • DRM-encumbered EPUBs are rejected.
  • Kindle AZW3/MOBI is a later type, not an alias of EPUB.
Other conversions

Other conversions from OpenDocument: HTMLMarkdownWordRTFPDF

Other ways to get EPUB: HTMLMarkdownWordRTFPDF