About ODT Files
OpenDocument Text
ODT is the open-standard document format used by LibreOffice Writer and other open-source word processors. It offers full document editing capabilities without vendor lock-in.
Family
Documents & Text
Extension
.odt
MIME Type
application/vnd.oasis.opendocument.text
Can Use As
HOW ODT
CAME TO BE.
ODT — OpenDocument Text — is the flagship format of the OpenDocument Format (ODF) family, standardized by OASIS in 2005 and approved as ISO/IEC 26300 the following year. It was born from OpenOffice’s earlier SXW format, itself descended from StarOffice’s binary XML format. The design goals were explicit: fully open, vendor-neutral, and immune to corporate lock-in.
ODF became the default in LibreOffice, OpenOffice, and most Linux distributions. It also became a political format — several European governments (Netherlands, UK, Italy) mandate ODF for public documents to avoid dependency on Microsoft Office. In the real world, most .odt files end up converted to DOCX for the last-mile delivery, but the format remains the principled choice for open-source workflows.
CURIOSITIES &
TRIVIA.
An .odt is a ZIP archive — same idea as DOCX but with different XML schemas inside.
The UK government in 2014 mandated ODF for public documents, saving an estimated £1.2 billion in Microsoft Office licenses.
Every .odt file includes a mandatory META-INF/manifest.xml listing every other file — strict by design.
The ODF TC considered and rejected compatibility with Office Open XML; the two standards evolved deliberately in parallel.
ODF 1.3 (2020) added strong encryption, digital signatures, and change tracking improvements.
STRENGTHS &
LIMITATIONS.
Strengths
- Truly open standard — ISO/IEC 26300, vendor-neutral.
- Native format of LibreOffice and OpenOffice, two of the largest FOSS projects.
- Human-readable XML, easy to script and parse.
- Preferred by many governments for archival and public records.
- ZIP compression keeps files compact.
Limitations
- Microsoft Word support exists but subtly breaks formatting when round-tripping.
- Less common outside the FOSS ecosystem — most business workflows default to DOCX.
- Fewer third-party tools than for DOCX.
- Complex spreadsheet-like embedded content may not round-trip perfectly.
Typical Sizes & Weights
Short letter
10-30 KB
Academic paper (20 pages)
50-200 KB
Illustrated report
1-10 MB
Technical Specifications
- MIME type
- application/vnd.oasis.opendocument.text
- Container
- ZIP (OpenDocument Format)
- Standard
- ISO/IEC 26300 (OASIS ODF 1.0 / 1.3)
- Native to
- LibreOffice, OpenOffice, Collabora
CONVERT FROM
ODT
CONVERT TO
ODT
Common Use Cases
LibreOffice documents, government documents, open-format requirements.
Related Formats
Popular comparisons
ODT vs PDF
Differences, file size, and when to choose each format.
ODT vs JPG
Differences, file size, and when to choose each format.
ODT vs PNG
Differences, file size, and when to choose each format.
ODT vs TXT
Differences, file size, and when to choose each format.
ODT vs EPUB
Differences, file size, and when to choose each format.
ODT vs DOCX
Differences, file size, and when to choose each format.
Popular ODT conversions
The most-requested destinations when starting from ODT.
Frequently Asked Questions about ODT
Frequently Asked Questions
ODT (OpenDocument Text) is a document format used to store paginated text, with optional formatting, tables, images, hyperlinks, headers and footers. It sits in the documents & text family and is typically associated with a specific office suite or publishing pipeline that defined the format and ships the canonical reader.
Modern office suites — Microsoft Word, Google Docs, LibreOffice Writer, Apple Pages — open most ODT files with reasonable fidelity. If your installed software does not support ODT, convert to DOCX or PDF first using KaijuConverter; both open in virtually every reader, including free online viewers.
Upload the ODT to KaijuConverter and pick DOCX, PDF, ODT, RTF, HTML, Markdown, or plain text. Our pipeline runs LibreOffice headlessly plus pandoc for text formats — the same engines behind professional document pipelines. Styles, tables, images, and hyperlinks survive the conversion intact.
Yes, to a high degree. Standard fonts, headings, lists, tables, images, hyperlinks and page structure transfer cleanly. Custom fonts substitute to the closest match if not embedded; obscure layout features unique to ODT (frames, legacy macros) may flatten to static content in the target format.