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WK1 123
File conversion

Convert WK1 to 123

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Is it possible to convert WK1 to 123?
Yes - WK1 converts to 123.

.123 is the later Lotus 1-2-3 Millennium format. Converting WK1->.123 only makes sense inside the legacy Lotus ecosystem; for modern use, target XLSX/ODS instead.

4 programs
Also to 123: WKS · WK4

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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How to convert WK1 to 123

Converting a .WK1 file to .123 lets you open the content in software that prefers the .123 format, though some details may change compared with the original. The programs listed below open .WK1 files and can save or export them to .123 (or a closely related format). One of them is Lotus 1-2-3: Lotus 1-2-3 was a spreadsheet application originally developed by Lotus Development Corporation and later maintained by IBM after its acquisition of Lotus. It….

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

Programs that convert WK1

Lotus 1-2-3
Corel Quattro Pro
LibreOffice Calc
Apache OpenOffice Calc (OpenOffice.org Calc)

About these formats

.WK1 Lotus 1-2-3 Release 2 Worksheet

A WK1 file is a spreadsheet created by Lotus 1-2-3 Release 2.x for DOS (1985). Modern Microsoft Excel cannot open it - support was removed in Excel 2007. Use the free LibreOffice Calc or…

Open .WK1 details →
.123 Lotus 1-2-3 Spreadsheet (Millennium / 97+)

A .123 file is a spreadsheet created by Lotus 1-2-3 (the 97 and Millennium Edition releases), a program discontinued by IBM in 2013-2014. Modern Microsoft Excel cannot open it because the…

Open .123 details →