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Supports: ODT
ODT (OpenDocument Text) is the word-processing document type of the OpenDocument Format (ODF), a vendor-neutral, royalty-free standard maintained by the OASIS technical committee. OASIS approved ODF 1.0 on 1 May 2005, and it was later adopted internationally as ISO/IEC 26300 (published 30 November 2006). An ODT file is really a ZIP archive of XML files describing the text, styles, and embedded images — the same underlying idea DOCX uses. ODT is the default save format in LibreOffice Writer and Apache OpenOffice Writer, which is exactly why people end up needing to convert it: the format is excellent, but not everyone on the other end has an ODF-capable editor.
Common reasons to convert away from ODT:
.docx. Converting first avoids the "some features may not transfer" prompt and gives the recipient a native Office Open XML file. Note that tracked changes, document protection, watermarks, and themes don't always survive the round trip in either direction — the body text and basic formatting do..doc format that was Word's default through Word 2003. Converting ODT to DOC keeps those tools working.| Property | ODT | DOCX | DOC |
|---|---|---|---|
| Full name | OpenDocument Text | Office Open XML (Word) | Word Binary Document |
| Standard | ODF — OASIS / ISO/IEC 26300 | OOXML — ECMA-376 / ISO/IEC 29500 | Proprietary binary (Microsoft) |
| Standardized | 2005 (OASIS), 2006 (ISO) | 2006 (Ecma), 2008 (ISO) | Never an open standard |
| File structure | ZIP archive of XML | ZIP archive of XML | Single binary blob (OLE) |
| Default in | LibreOffice / OpenOffice Writer | Microsoft Word 2007+ | Microsoft Word 97–2003 |
| Open / royalty-free | Yes | Yes (Ecma); patent terms apply | No |
| Best for | Open-source office suites, archival | Microsoft Word collaboration | Legacy Word and old software |
ODT is the native format of LibreOffice Writer and Apache OpenOffice Writer — both free — and is also opened by Calligra Words and Google Docs. Microsoft Word 2007 and later can open and save ODT directly, though Word may warn that a few Word-specific features (like tracked changes or certain themes) won't transfer perfectly. If you don't want to install anything, converting the ODT to PDF or DOCX is the quickest way to make it readable everywhere.
Most of it survives — body text, headings, fonts, tables, lists, and embedded images map cleanly between ODT and DOCX because both are ZIP-of-XML formats with similar structures. What can shift are features that don't have a one-to-one equivalent across ODF and Office Open XML: Microsoft documents that tracked changes are flattened (revisions are accepted), document protection and IRM are dropped, and watermarks, themes, and tables nested inside comments may not carry over. For a plain text-and-tables document, the conversion is essentially lossless; for one heavy on Word-specific or ODF-specific extras, spot-check the result.
Yes. PDF is a fixed-layout format, so once you convert, the page breaks, fonts, and spacing are locked and render identically on any device or printer — which is exactly what you want for a document meant to be read or printed rather than re-edited. ODT and DOCX are reflowable and can re-wrap differently depending on the viewer's app, fonts, and settings, so they're better while you're still editing and worse for final distribution.
DOCX is the modern Office Open XML format (a ZIP of XML, default in Word since 2007); DOC is the older binary format that was Word's default through Word 2003. Pick DOCX unless you specifically need to open the file in software so old it predates 2007 — DOCX is smaller, more robust against corruption, and what every current version of Word, Google Docs, and LibreOffice expects.
On our servers. Your ODT file is uploaded over an encrypted (TLS) connection, converted on our servers, and then deleted automatically after a few hours — no sign-up, no watermark, and files are never shared or made public. Because the work happens server-side, the main practical limit is upload size and your connection speed, not your device's memory.
Yes — that's what the Compression Type dropdown controls. In our testing, a 12-page ODT report with several embedded photos came out around 60% smaller on the Screen (Best) preset than on Prepress, because Screen downsamples embedded images for on-screen reading. Use Screen or Ebook for email and web sharing, and switch to Printer or Prepress only when you actually need print-resolution images in the PDF.