Open Document Format

Open Document Format is an XML-based open standard for office documents — spreadsheets, word-processing files, and presentations — standardised as ISO/IEC 26300 and OASIS ODF. Developed as a vendor-neutral alternative to Microsoft's proprietary Office formats, ODF is the default format mandated in Germany's Sovereign Tech Standards programme and recommended by the European Commission for interoperability in public-sector document exchange. Germany's 2026 Sovereign Tech Standards announcement explicitly cited ODF adoption as a sovereignty instrument, alongside IETF and W3C participation .

ODF was created by the OASIS consortium in 2005 and ratified as an ISO/IEC standard in 2006, partly driven by European government concern over reliance on Microsoft Office's proprietary `.doc` and `.xls` formats. LibreOffice, OpenOffice, and Calligra implement ODF natively; Google Workspace and Microsoft 365 support ODF import/export but do not use it as their primary format. The UK Government adopted ODF as the compulsory standard for sharing editable documents in 2014; several EU member states mandate or recommend it in public procurement.

ODF's strategic relevance in European tech sovereignty is that it represents a rare instance where an open standard successfully challenged a dominant proprietary format in the public sector. Enforcement is uneven — many agencies still exchange `.docx` files by habit — but ODF is cited in the Commission's interoperability framework as the correct format for government-to-government document sharing, reducing dependence on Microsoft's licensing terms for access to public records.