What File Format Does LibreOffice Use?

LibreOffice uses the OpenDocument Format (ODF) as its default standard for saving all types of documents. ODF is an open, XML-based file format standard maintained by the Organization for the Advancement of Structured Information Standards (OASIS) and officially recognized by the International Organization for Standardization (ISO). This article covers the specific file extensions used across the LibreOffice application suite, the benefits of the OpenDocument standard, and how LibreOffice handles compatibility with other formats such as Microsoft Office.

Default LibreOffice File Extensions

LibreOffice applies a specific ODF extension depending on the application used to create the document:

• LibreOffice Writer (Text Documents): .odt (OpenDocument Text)
• LibreOffice Calc (Spreadsheets): .ods (OpenDocument Spreadsheet)
• LibreOffice Impress (Presentations): .odp (OpenDocument Presentation)
• LibreOffice Draw (Graphics/Drawings): .odg (OpenDocument Graphics)
• LibreOffice Math (Formulas): .odf (OpenDocument Formula)
• LibreOffice Base (Databases): .odb (OpenDocument Database)

Why LibreOffice Uses the OpenDocument Format

The choice of ODF as the native standard is driven by several practical and technical advantages:

• Open Standard: ODF is free from proprietary restrictions, meaning no single company owns or restricts access to the format.
• Long-Term Accessibility: Because the format specifications are publicly documented, files saved in ODF remain accessible and readable even if software vendors change or discontinue specific programs.
• Cross-Platform Compatibility: ODF is supported by a wide variety of productivity tools, including Google Docs, Microsoft Office, Apache OpenOffice, and AbiWord.
• Standardized Security: ODF natively supports digital signatures and standard XML-based encryption algorithms to secure confidential files.

Compatibility with Other Formats

While ODF is the default, LibreOffice provides full support for opening, editing, and exporting to alternative formats:

• Microsoft Office Formats: LibreOffice can read and write modern Microsoft formats (.docx, .xlsx, .pptx) as well as legacy formats (.doc, .xls, .ppt).
• Direct Exporting: Users can export documents directly to Portable Document Format (.pdf), EPUB, and HTML without requiring external plugins.
• Default Format Configuration: Users who frequently collaborate with Microsoft Office users can change LibreOffice’s settings (via Tools > Options > Load/Save > General) to automatically save files in Microsoft formats by default instead of ODF.