ODT (.odt)
OpenDocument Text format from the LibreOffice/OpenOffice ecosystem. ISO-standardised, vendor-neutral alternative to DOCX for text documents.
- Extension
- .odt
- MIME Type
- application/vnd.oasis.opendocument.text
Last updated
Overview
ODT (OpenDocument Text) is the text document format of the OpenDocument Format (ODF) standard, developed by the OASIS consortium and first standardised by ISO in 2006. It is the native format of LibreOffice Writer, Apache OpenOffice, and Google Docs (which can export to ODT). Like DOCX, an ODT file is a ZIP archive containing XML files — one for content, one for styles, and one for metadata.
ODT was created to provide a vendor-neutral, open-standards alternative to Microsoft's proprietary DOC and DOCX formats. Many government agencies in Europe and beyond have mandated ODT (or ODF generally) for official documents to ensure long-term accessibility and interoperability without dependency on Microsoft software.
Common Uses
- LibreOffice documents — ODT is the default save format for LibreOffice Writer
- Government and public sector — many EU countries mandate ODF/ODT for government documents
- Academic institutions — universities that provide LibreOffice rather than Microsoft Office
- Long-term archival — ISO-standardised format with no vendor lock-in concerns
Advantages
- Open ISO standard — fully documented, patent-free, and accessible to all implementers
- No vendor lock-in — not controlled by any single company; multiple implementations exist
- ZIP-based — contents are XML files inside a ZIP; can be inspected and modified with any text editor
- Free software — LibreOffice, which reads and writes ODT natively, is completely free
Limitations
- Microsoft Office compatibility — Word can open ODT but rendering may differ from LibreOffice for complex formatting
- Smaller ecosystem — fewer third-party tools and templates compared to DOCX
- Macro incompatibility — ODT macros use Basic (LibreOffice) rather than VBA (Microsoft), preventing macro migration
- Lower adoption — most businesses and individuals default to DOCX; ODT files require explaining to recipients
Supported Software
- Full support: LibreOffice Writer, Apache OpenOffice Writer
- Partial support: Microsoft Word 2010+, Google Docs (export only)
- Mobile: OnlyOffice, Collabora Office
- Online: Google Docs (upload and convert)