Everything you need to know about ODT
ODT (OpenDocument Text, .odt) is the open-source equivalent of DOCX - a ZIP-packaged XML document format defined by ISO/IEC 26300. It's the native format of LibreOffice, Apache OpenOffice, and the OASIS-standardized alternative championed by governments wary of Microsoft lock-in.
How it works under the hood
- ODF family. ODT (text), ODS (spreadsheet), ODP (presentation), ODG (graphics) are siblings - same archive structure, different schemas.
- OASIS standard. Originally developed for OpenOffice and ratified by OASIS in 2005, then ISO in 2006. Genuinely open - no vendor controls evolution.
- ZIP with content.xml. Like DOCX, ODT is ZIP. The main file is `content.xml` (text and structure), `styles.xml` (formatting), `meta.xml` (metadata).
- Schema clarity. ODF's XML schema is widely considered cleaner than OOXML's. OOXML has many backwards-compatibility quirks; ODF is greenfield.
Where you'll actually use it
- Government documents in EU jurisdictions mandating open formats
- Open-source projects requiring vendor-neutral file formats
- LibreOffice's native save format
- Cross-platform documents where DOCX compatibility is uncertain
How it compares to alternatives
ODT vs DOCX: ODT has cleaner schema; DOCX has wider tool support. Most apps now read both. ODT vs PDF: ODT is editable; PDF is fixed. ODT vs Markdown: Markdown is plain text; ODT supports rich formatting and embedded media.
Things that will trip you up
- Microsoft Word can read ODT but tracks changes show up oddly - keep collaborative editing in one format
- ODT styling can render slightly differently between LibreOffice and OpenOffice - test on the target tool
- Mobile support is poor - LibreOffice Mobile and Collabora are the main options
Test it yourself: LibreOffice Writer (canonical), Apache OpenOffice, Microsoft Word (basic compatibility). Pandoc converts to/from ODT.