Free online WK1 to PDF converter

A legacy Lotus 1-2-3 spreadsheet may need conversion when modern software cannot open .wk1 files but a fixed-layout copy is required for printing, sharing, or archiving. PDF lets recipients view the worksheet without installing Lotus 1-2-3 or spreadsheet software.

What the WK1 format is

WK1 is the Lotus 1-2-3 Release 2.x spreadsheet format. It stores worksheet cells, formulas, labels, numbers, basic formatting, and some chart and print information. WK1 files are found in older business, accounting, DOS, and Windows document archives.

WK1 is a proprietary legacy format rather than a modern open spreadsheet standard. Current spreadsheet programs may import it with limitations, and some may not support it at all. The extension should not be confused with other Lotus 1-2-3 formats such as .wks, .wk2, or .wk3.

What the PDF format is

PDF is a fixed-layout document format designed to preserve page size, positioning, text appearance, and print pagination across applications and operating systems. It is useful for distributing a read-only report, printing a worksheet, or storing a viewable archival copy.

PDF is not an editable replacement for the workbook. Exported pages normally contain rendered text, values, and graphics rather than the original cell structure, formulas, macros, or spreadsheet calculations.

How to convert a WK1 file

Using LibreOffice Calc

1. Install a current desktop version of LibreOffice and open Calc.
2. Choose File → Open, select the .wk1 file, and set the file filter to All files if the file is not shown.
3. Check the imported worksheet for changed formulas, dates, characters, column widths, fonts, charts, and formatting.
4. Define the required output area with Format → Print Ranges → Define. Set paper size, orientation, margins, and scaling under Format → Page Style.
5. Choose File → Export as PDF. In versions that show a submenu, choose File → Export as PDF → Export as PDF.
6. Specify a destination such as report.pdf, then select Export.

If Calc cannot import the file, open the original with a compatible older Lotus 1-2-3 installation or another legacy spreadsheet program that supports WK1. Save a working copy as .ods or .xls, open that copy in Calc, and export it to PDF. Do not overwrite the original file.

Using 101convert.com

101convert.com provides conversion without installing desktop software: upload the .wk1 file, choose PDF as the output, start the conversion, and download the result. Do not upload confidential financial, personal, or business records unless the service's privacy, retention, and processing terms are acceptable.

Quality and compatibility limitations

WK1 import can change Lotus 1-2-3-specific formulas, macros, charts, named ranges, dates, fonts, and cell formatting. Compare important totals with the original workbook or an authorized legacy application before distributing the PDF.

PDF export uses print settings, not the worksheet's on-screen dimensions. Without a defined print range and suitable scaling, wide columns can be split across pages or reduced to unreadable text. Open the generated PDF and inspect every page, including formulas shown as values, chart placement, page breaks, and non-ASCII characters.