Free converter
XLSXXLSXLSX to XLS Converter
Older systems, machine tools and institutional templates sometimes accept nothing but .xls. This converter takes a modern workbook back to the legacy format locally, with no upload and no cost.
Drop in your files — An .xls per workbook, in the folder you choose.
Why convert
Why convert XLSX to XLS?
It is a downgrade, and you only do it when something forces you to — a legacy import routine, an old install of Excel, or equipment software that was written before 2007 and never revisited.
- A legacy import routine accepts .xls only.
- The recipient runs a pre-2007 version of Excel.
- Equipment or lab software reads the old format exclusively.
- An institutional template requires it.
How it works
Convert XLSX to XLS in a few clicks
- 1
Open Office Converter
Pick it from the tray. No engine download for this path.
- 2
Add the workbooks
One XLSX or a whole folder.
- 3
Choose XLS
Select the legacy format as the target.
- 4
Convert
Set the output folder and run.
The details
XLSX to XLS, at a glance
- Input
- XLSX
- Output
- XLS (Excel 97–2003)
- Row ceiling
- 65,536 rows per sheet — anything beyond that cannot fit the older format
- Preserved
- Sheets, values and standard formatting
- Engine download
- None
- Limits
- No file-size cap, no watermark
Questions
XLSX to XLS Converter, answered
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Convert XLSX to XLS — free
It's one tool inside BizTray, alongside the PDF Organizer, PDF Tools, and Fill & Sign. One small download, no account.
Local, private, no watermark.