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WK4 CSV
Free online converter

Convert WK4 to CSV

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WK4 to CSV converterFREE
Drop a .WK4 file here
or pick one - we convert it to .CSV and give you the file to download

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert WK4 to CSV

  1. Add your .WK4 file - drop it in the box above or click to browse.
  2. Convert it to .CSV in a few seconds.
  3. Download your new .CSV file.

What to expect

  • Formulas are not saved - CSV stores only the computed cell values from the last Lotus save.
  • WK4 supports multi-sheet (3D) workbooks; CSV is flat, so each sheet must be exported as a separate .csv file.
  • Modern Excel (2007 and later) cannot open .wk4 files - convert via LibreOffice Calc first, then open the resulting .csv in Excel.

Frequently asked questions

Can Excel open or convert WK4 directly?
No - Excel removed the Lotus WK4 import filter in 2007. Open the .wk4 in LibreOffice Calc first, then export as CSV or XLSX.
Will I lose data when converting WK4 to CSV?
Cell values are preserved, but formulas, formatting, and chart objects are lost. If the workbook has multiple sheets, only the active sheet is exported per file.
How do I export all sheets from a multi-sheet WK4 file?
In LibreOffice Calc, click each sheet tab in turn and do File > Save As > Text CSV for each one, saving under a different file name.
Is WK4 still supported by modern software?
LibreOffice Calc and Corel Quattro Pro still read it, but the format is obsolete - convert your files now before support is dropped entirely.
Learn about the formats: .WK4 · .CSV
Programs that convert WK4: Microsoft Excel · ABC Amber Lotus Converter · Corel Quattro Pro · LibreOffice Calc