Open WK1 files in your browser
The worksheet of Lotus 1-2-3 release 2, the DOS spreadsheet of the 1980s. Open one right here, now that Excel no longer does. Nothing leaves your device.
Or drop it anywhere on this page
What you'll see
Your workbook opens at the sheet it was saved on, drawn as its app draws it, with its tabs along the bottom.
- Every sheet • Formats, merges and frozen panes
- Show formulas • Behind every value
- Show as a table • Sort, filter and search
- Export • Save a sheet or all of them as CSV
About WK1
Lotus 1-2-3 release 2 came out for DOS in 1985 and became the spreadsheet of its time, and its .wk1 worksheets became a format every other spreadsheet could read and write. Quattro Pro, Excel and many databases and accounting programs saved WK1 to pass tables on.
A WK1 is a single sheet of records, one for each cell: its value, label or formula, with the column widths, number formats and named ranges after them. Microsoft Office stopped opening Lotus files with Office 2013, so the WK1s on old disks and in exports from old programs have no Microsoft app left to open them.
Filepeek reads the worksheet with libwps, the open source reader LibreOffice uses, compiled to WebAssembly, and draws every cell with its value and format in a grid of its own. Show formulas reveals what's behind each value, Show as a table sorts, filters and searches it, and Export saves it as CSV.
Lotus 1-2-3 worksheet
.wk1
Format
- MIME type
- application/vnd.lotus-1-2-3
- Made by
- Lotus Development
- Released
- 1985
Inside the file
- Cells
- Values, labels and formulas
- Look
- Number formats and column widths
- Names
- Named ranges
- Written by
- 1-2-3 release 2 and many others
Opens in every browser
Filepeek opens WK1 files in Chrome, Edge, Firefox and Safari. Excel no longer opens them, and browsers only download them.
- YouChromeOpens through Filepeek
- YouEdgeOpens through Filepeek
- YouFirefoxOpens through Filepeek
- YouSafariOpens through Filepeek
Apps that open WK1
- WindowsLibreOffice Calc opens it • Excel stopped with Office 2013
- MacLibreOffice Calc opens it
- iPhone and iPadNo app built in opens it
- AndroidNo app built in opens it
Questions
Why won't Excel open my WK1 file?
Microsoft Office stopped opening Lotus 1-2-3 files with Office 2013. Drop the file here instead: every cell shows, and Export saves the sheet as CSV, which Excel opens.
Are the formulas kept?
Yes. Values show as they were saved, and Show formulas reveals the formula behind each one. Nothing is worked out again.
Does it open WKS and WK3 too?
Yes. The first 1-2-3 saved WKS, and release 3 and later saved WK3, WK4 and 123, and all of them open.