Select files for conversion or just drag and drop them to the upload area
| Name | WK1 |
| Full name | Lotus 1-2-3 spreadsheet |
| File extension | .wk1 |
| MIME type | |
| Developed by | IBM |
| Type of format | |
| Description | WK1 file extension is associated with Lotus 1-2-3 version 2.x and used for spreadsheet documents. The WK1 files were used as the default spreadsheet format of Lotus 1-2-3 version 2 including rows and columns, formulas etc. Lotus 1-2-3 is a discontinued product. |
| Technical details | |
| Associated programs | Lotus 1-2-3 |
| Wiki | https://en.wikipedia.org/wiki/Lotus_1-2-3 |