Convert Excel spreadsheets to XLS online

To convert Excel to XLS, upload the Excel file, start the conversion and download the result. LibreOffice opens the Excel and saves it as XLS; styles and tables carry over where XLS supports them.

◈ Encrypted transfer◷ Short retention⊘ No watermark◎ Works on every device

Excel to XLS at a glance

Converts: Microsoft Excel workbook → XLS spreadsheet format
Engine: LibreOffice
Privacy: Private download link; files are deleted after 6 hours. No account needed.

Excel to XLS: The workbook object-model rebuilding route explained

Cells, sheets, formulas, types, and print settings are read from Excel and mapped into structures XLS can express. A displayed total is not enough evidence; formulas and leading zeros may have changed underneath it. The generic Excel label is resolved to the actual workbook generation before sheets, formula dialect, dates, macros, links, styles, and charts are interpreted. XLS output targets the legacy binary Excel grid and its older row, column, formula, chart, macro, and date-system limitations.

Read as a generic spreadsheet destination for cells, tables, formulas, and worksheet data. Rebuilt as the legacy binary Excel workbook with cells, formulas, formats, and older size limits.

Need a different output? See all Excel conversion options.

Background reading: the field guide to file formats covers why a format is a set of tradeoffs rather than a label.

Excel

Microsoft Excel workbook

Used for structured spreadsheets and calculations.

Family: Documents
MIME: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

→

XLS

XLS spreadsheet format

Designed for structured rows and columns of calculated data.

Family: Documents
MIME: application/vnd.ms-excel

How to confirm the converted XLS actually works

Record the Excel evidence before conversion

Open the result in the required spreadsheet app and recalculate formulas before relying on totals.

Test the XLS file in its receiving workflow

Recalculate in the target Excel version and inspect formulas, dates, named ranges, charts, and sheet count.

What the Excel source carries and the XLS output demands

What can fail when Microsoft Excel workbook is interpreted

A generic Excel route may not preserve every workbook feature or choose the version a legacy system expects.

What XLS spreadsheet format cannot safely promise

Newer functions, long worksheets, charts, macros, and date systems may not fit the XLS model.

How the XLS writer handles this route

The writer builds the legacy binary Excel workbook with cells, formulas, formats, and older size limits and labels the result as application/vnd.ms-excel. The receiving application - Not the extension alone - Is the final compatibility test.

The delivery decision for this Excel to XLS route

Choose XLS when its editing, reflow, or reader support is more valuable than exact Excel structure, and test the most complex page or chapter before committing.

What changes between the Excel model and the XLS deliverable

LibreOffice opens the Excel and saves it as XLS; styles and tables carry over where XLS supports them.
Metadata handling differs between Excel and XLS; do not assume every application-specific field carries across untouched.