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123 WK1
File conversion

Convert 123 to WK1

Verified by Adam B.· reviewed by FE Editorial ·updated Jul 17, 2026
QUICK ANSWER
Is it possible to convert 123 to WK1?
Yes - 123 converts to WK1.

The fastest path is the converter above: upload your .123 file and download the .wk1 result in seconds. The key caveat is that .wk1 supports only a single worksheet, so any extra sheets, charts, and rich formatting are dropped during conversion.

4 programs
Also to WK1: WK4 · WKS · ODS

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Why convert 123 to WK1?

Converting .123 to .WK1 is a deliberate down-conversion done for legacy reasons - chiefly to feed industrial controllers, CNC machines, or old lab instruments that read Lotus Release 2 files and have never been updated to accept newer formats. It is also sometimes needed to pass data into older Lotus-era software still running in production environments. This is a niche use case; if you just want the data in a modern tool, export to XLSX or CSV instead.

How to convert 123 to WK1

LibreOffice Calc - Save As WK1 FREE

Open the .123 file in LibreOffice Calc, move the data you need to Sheet 1, then use File > Save As and choose the Lotus 1-2-3 1.0 (.wk1) filter.

Gnumeric - Save As WK1 FREE

Open the .123 file in Gnumeric, select the sheet to keep, then Save As and pick the "Lotus 1-2-3 (WK1)" format.

Command line - LibreOffice CLI

Run libreoffice --headless --convert-to wk1 input.123 to batch-convert without opening the GUI.

Programs that convert 123

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

About these formats

.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 →
.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 →

Quality & what to watch

  • .wk1 is a single-sheet format - only the first (or active) sheet from a .123 workbook is exported; all other sheets are silently dropped.
  • Charts, named ranges, and cross-sheet formulas are not preserved; only cell values and basic single-sheet formulas transfer.
  • Modern Microsoft Excel (2007 and later) removed all Lotus format support and cannot open or save .wk1 files - use LibreOffice Calc or Gnumeric instead.

Frequently asked questions

Will all sheets in my .123 file be converted?
No. .wk1 supports only a single worksheet, so only one sheet carries over and the rest are lost.
Does Microsoft Excel export WK1?
No - Excel 2007 and later dropped all Lotus format filters. Use LibreOffice Calc or Gnumeric for this conversion.
Why would anyone need a .wk1 file today?
Mostly for industrial or lab equipment - CNC machines, controllers, and instruments built to read Lotus Release 2 files that have never been updated to support newer formats.
Can I convert .wk1 back to .123?
Yes, LibreOffice Calc and Gnumeric can both open .wk1 and save as .123, but for any modern workflow XLSX or ODS are more practical targets.