Convert Lotus 1-2-3 spreadsheets (WK3) online for free
The converter easily converts your WK3 spreadsheets to various formats - free and online. No Lotus 1-2-3 or or other Spreadsheet software needed.
To convert other file formats to the "Legacy Spreadsheet File" file type, you need software like Lotus 1-2-3 or a similar tool.
The .wk3 file is a legacy spreadsheet format created by Lotus 1-2-3 (Release 3), a highly influential early spreadsheet application developed by Lotus Software and later acquired by IBM. These files store data in rows and columns, formulas, charts, and notably introduced 3D worksheet capabilities. Historically, users opened these files using Lotus 1-2-3. Today, desktop access requires backward-compatible software like Microsoft Excel (though often restricted) or the open-source LibreOffice Calc.
You need to convert .wk3 files because the format is practically extinct. Lotus 1-2-3 was discontinued entirely in 2013. Keeping your financial or historical data in this format is a massive liability. Modern 64-bit operating systems and current office suites frequently block .wk3 files by default due to security vulnerabilities associated with legacy code. Attempting to open them natively often results in formatting errors or complete failure. Drop your file here to view and convert it securely right in your browser without dealing with desktop software settings.
For modern editing and sharing, convert your file to XLSX. If you only need to extract the raw data for a database or another system, convert to CSV (note that formulas will be lost). For permanent, unalterable archiving, convert to PDF. Be aware that any legacy Lotus macros will be permanently stripped during modern conversion.
Use Convert.Guru to open and convert your WK3 file.
Users also converted FM3, WK4, WK1 and XLS files.
If you want to convert WK3 file to XLSM, XLSB, WK1 or NOTES, you can use Lotus 1-2-3 or similar software from the "Legacy Spreadsheet Storage" category. In the File menu, look for Save As… or Export….
To convert WQ1, XLSM, NOTES, QPW, WB2, WKS, XLSB, 123, XLS, WB1, XLSX or WK1 files to WK3, try Lotus 1-2-3 or another comparable tool in the "Legacy Spreadsheet Storage" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our WK3 converter.