OpenDocument Format (ODF), formally the Open Document Format for Office Applications, is an open standard for the files produced by office software: text documents (.odt), spreadsheets (.ods), and presentations (.odp), among others. The OASIS specification describes its schema as “suitable for office documents, including text documents, spreadsheets, charts and graphical documents like drawings or presentations.” Like other modern office formats, an ODF file is a ZIP package containing several XML parts — the document content, its styles, metadata, and settings — so the format is text-based, inspectable, and processable by any conforming application.
ODF was created to provide a single, vendor-neutral, openly specified format for office documents that was not controlled by any one company. Its design grew out of the XML file format used by OpenOffice.org, which was contributed to OASIS and refined by a technical committee into a general standard. By defining the document schema and its semantics in a public specification, ODF aimed to guarantee that documents could be opened, edited, and preserved long-term without dependence on a particular proprietary product, a concern that made it especially attractive to governments and archives.
The standard was approved as an OASIS Standard in 2005 and then adopted by the international standards process as ISO/IEC 26300 in 2006. Subsequent OASIS versions, including ODF 1.1 and the multi-part ODF 1.2, refined the schema, formula specification, and metadata model, with the ISO standard tracking these revisions. The format is governed by the OASIS Open Document Format for Office Applications (OpenDocument) Technical Committee, which maintains the specification on a vendor-neutral basis.
ODF is the native file format of LibreOffice and was the native format of its predecessor OpenOffice.org from which LibreOffice was forked, and it is supported by a range of other office suites. Its emergence set up a direct standards rivalry with Microsoft’s Office Open XML: for a period the two formats were competing, separately standardized answers to the same problem of representing office documents in XML, and several governments and public institutions adopted ODF specifically to avoid lock-in to a single vendor’s software.
The lasting significance of ODF is that it established that everyday office documents could be governed by an open, internationally standardized, XML-based specification rather than an undocumented proprietary binary. It gave open-source office suites a first-class, fully documented native format, gave institutions a defensible choice for long-term document preservation, and forced the broader question of document-format openness into public policy, where it remains a reference point for digital sovereignty and archival durability.