Convert XLS to Excel online

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

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

XLS to Excel at a glance

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

Workbook object-model rebuilding: How XLS becomes Excel

Cells, sheets, formulas, types, and print settings are read from XLS and mapped into structures Excel can express. A displayed total is not enough evidence; formulas and leading zeros may have changed underneath it. XLS uses a legacy binary workbook stream whose formulas, shared strings, formats, sheets, charts, and date system must be interpreted before export. An Excel-labeled result promises workbook-style cells and sheets but still requires the concrete file generation, formula dialect, recalculation, and macro behavior to be verified.

Read structure - The legacy binary Excel workbook with cells, formulas, formats, and older size limits. Rebuilt structure - A generic spreadsheet destination for cells, tables, formulas, and worksheet data.

Starting from another format? Check which other files convert to Excel.

Before converting a whole batch, read how to choose a file format by what must survive; it explains why a format is a set of tradeoffs rather than a label.

XLS

XLS spreadsheet format

Used for structured rows and columns of calculated data.

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

→

Excel

Microsoft Excel workbook

Designed for structured spreadsheets and calculations.

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

Acceptance evidence for the converted Excel

Record the XLS evidence before conversion

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

Test the Excel file in its receiving workflow

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

Reading XLS correctly and satisfying what Excel expects

What can fail when XLS spreadsheet format is interpreted

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

What Microsoft Excel workbook cannot safely promise

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

How the Excel writer handles this route

a generic spreadsheet destination for cells, tables, formulas, and worksheet data is what gets written, labeled as application/vnd.openxmlformats-officedocument.spreadsheetml.sheet. Whether that actually opens depends on the receiving application, not on the file extension.

When to actually choose XLS to Excel

Excel earns its place when its editing, reflow, or reader support outweighs exact XLS structure - Just test the most complex page or chapter before committing to it.

What changes between the XLS model and the Excel deliverable

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