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 |
|---|---|---|---|
| Gnumeric | .gnumeric / .gnm | YES | YES |
| Applix | .as | YES | |
| Comma Separated Values | .csv | YES | YES |
| Data Interchange Format | .dif | YES | YES |
| GNU Oleo | .oleo | YES | |
| HTML | .html / .htm | YES | YES |
| LaTeX | .tex | YES | |
| Linear and Integer Program | none / .mps | YES | |
| Lotus 1-2-3 | .wk1 / .wks | YES | |
| Microsoft Excel | .xls | YES | YES |
| Multiplan SYLK | none / .slk | YES | |
| OpenOffice.Org / StarOffice | .sxc | YES | YES |
| Plan Perfect | .pln | YES | |
| Postscript | .ps / .eps | YES | |
| YES | |||
| Quattro Pro | .wb1 / .wb2 / .wb3 | YES | |
| SC/XSpread | none / .sc | YES | |
| Tab Separated Values | .tsv / .tab | YES | YES |
| Text Formats | .txt / .text | YES | YES |
| TROFF | .me | YES | |
| Xbase | .dbf | YES | |
| XHTML | .xhtml / .html | YES |