Gnumeric supports numerous file formats in addition to its own XML based format. The table below lists the formats currently supported. In the table below, the name of the format is a link which can be used to jump to the section which discusses the format.
| Format | Extension | Open | Save | Import | Export | MIME type |
|---|---|---|---|---|---|---|
| Gnumeric | .gnumeric / .gnm / .xml | YES | YES | application/x-gnumeric | ||
| Applix | .as | YES | application/x-applix-spreadsheet | |||
| Comma Separated Values | .csv | YES | YES | text/plain | ||
| Data Interchange Format | .dif | YES | YES | |||
| GNU Oleo | .oleo | YES | application/x-oleo | |||
| HTML | .html / .htm | YES | YES | text/html | ||
| LaTeX | .tex | YES | text/x-tex | |||
| Linear and Integer Program | none / .mps | YES | application/x-mps | |||
| Lotus 1-2-3 | .wk1 / .wks | YES | application/vnd.lotus-1-2-3, application/x-123 | |||
| Microsoft Excel Old Binary Format (versions 2 - 5) | .xls / .xlt / .xlw | YES | application/vnd.ms-excel | |||
| Microsoft Excel Binary Format (Excel 95 - 2003) | .xls / .xlt / .xlw | YES | YES | application/vnd.ms-excel | ||
| Microsoft Excel 2003 SpreadsheetML | .xlsx | YES | application/vnd.ms-excel | |||
| Microsoft Office Open SpreadsheetML (MOOX/ECMA376/ISO29500) | .xlsx | YES | YES | application/vnd.ms-excel | ||
| OpenOffice.Org / StarOffice Old Format | .sxc / .stc | YES | application/vnd.sun.xml.calc | |||
| OpenDocument Format (OASIS ODF and ISO/IEC 26300:2006) | .ods / .odt / .sxc / .stc | YES | YES | application/vnd.oasis.opendocument.spreadsheet | ||
| Paradox Database | .px / .db | YES | YES | |||
| Plan Perfect | .pln | YES | application/x-planperfect | |||
| Psion 5 Sheet Files | .psisheet | YES | ||||
| Postscript | .ps / .eps | YES | application/postscript | |||
| YES | application/pdf | |||||
| Quattro Pro | .wb1 / .wb2 / .wb3 | YES | application/x-quattropro, application/x-quattro-pro | |||
| SC/XSpread | none / .sc | YES | application/x-sc | |||
| Multiplan (SYLK) | .sylk / .slk | YES | YES | application/x-sylk | ||
| Tab Separated Values | .tsv / .tab | YES | YES | text/plain | ||
| Text Formats | .txt / .text | YES | YES | text/plain | ||
| TROFF | .me | YES | application/x-troff | |||
| Xbase | .dbf | YES | application/dbase, application/dbf, application/x-dbase, application/x-dbf, application/x-xbase, zz-application/zz-winassoc-dbf | |||
| XHTML | .xhtml / .html | YES | application/xhtml+xml |
Files in the file formats marked as Save/Open can be opened or saved with the Open, Save, and Save As menu items in the File menu. Files in the file formats marked as Import/Export can be imported or exported with the items on the Import Data and Export Data submenus of the Data menu.