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WK4 123
File conversion

Convert WK4 to 123

Verified by Adam B.· reviewed by FE Editorial ·updated Sep 2, 2026
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Is it possible to convert WK4 to 123?
Yes - WK4 converts to 123.

The fastest path is to use our free converter above - upload your WK4 and download the .123 result. Note that both formats are discontinued Lotus 1-2-3 formats; if you need to edit the data in a modern application, converting to .xlsx is the more practical choice.

3 programs
Also to 123: WKS · WK1

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert WK4 to 123?

Both .wk4 and .123 are binary spreadsheet formats from the Lotus 1-2-3 family, with WK4 coming from Releases 4-5 (1993) and .123 from the Millennium Edition (Release 9, late 1990s). The conversion is mainly needed when feeding data into a legacy Lotus 1-2-3 Millennium installation that expects the .123 format. Outside that narrow scenario, migrating data to .xlsx or .ods is the sensible modern path.

How to convert WK4 to 123

Lotus 1-2-3 Millennium Edition LEGACY

The only app that writes native .123 files: open your WK4 via File > Open, then File > Save As and choose the .123 format. Requires a legacy Windows environment - IBM discontinued the software in 2014.

Corel Quattro Pro APP

Quattro Pro reads WK4 files and supports export to Lotus-compatible formats including .123.

Command line - LibreOffice CLI

Run soffice --headless --convert-to 123 file.wk4 to convert a WK4 file to .123.

Programs that convert WK4

Lotus 1-2-3
Corel Quattro Pro
LibreOffice Calc

About these formats

.WK4 Lotus 1-2-3 Release 4 Worksheet

A WK4 file is a spreadsheet created by Lotus 1-2-3 Release 4 or 5, a program discontinued by IBM in 2013-2014. Modern Excel (2007 and later) cannot open WK4 because Microsoft removed the…

Open .WK4 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 →

Quality & what to watch

  • Both .wk4 and .123 are discontinued formats - for long-term data access, convert to .xlsx or .ods instead.
  • Lotus 1-2-3 was discontinued by IBM in 2014 and is no longer sold; using it requires a legacy Windows environment.
  • Password-protected WK4 files cannot be converted without the original password.

Frequently asked questions

Can LibreOffice Calc save a file as .123?
The LibreOffice GUI does not expose .123 as a save format, but its underlying engine supports the conversion - which is why our server-side tool can produce .123 output.
What is the difference between WK4 and .123?
WK4 is the Lotus 1-2-3 binary format from Releases 4 and 5 (1993); .123 is the later Millennium Edition format (Release 9, late 1990s). Both are proprietary binary formats from the same discontinued software family.
I just want to read my WK4 data - do I need .123?
No - open the WK4 file in LibreOffice Calc (free) and save as .xlsx or .ods to get the data into a format that works in modern applications.
Does Microsoft Excel open .123 files?
No - Excel 2007 and later removed its Lotus import filters and cannot open WK4 or .123 files directly.