XLS to XLSX converts old Excel 97-2003 .xls files, plus .xlsb, OpenDocument .ods and Apple Numbers files, into the modern .xlsx format that opens in every app and is accepted by more portals.

When to use XLS to XLSX

• Open an old .xls file from a government or bank site
• Convert LibreOffice .ods sheets for colleagues who use Excel
• Update a folder of old files in one go

How to use XLS to XLSX

1. Add one or more .xls, .ods or .numbers files.
2. Click Convert to XLSX.
3. Download each file, or all of them in a ZIP.

Questions about XLS to XLSX

Are my files uploaded?

No. The file is opened and changed inside your browser, on your phone or computer. Nothing is sent to our servers.

Is the formatting kept?

Values, formulas, dates and sheet names are kept. Colours, borders, merged-cell styles and charts may not carry over, because the file is rebuilt in your browser.

Are macros kept?

No. .xlsx files cannot hold macros, so they are left out.

Is it safe?

Yes. XLS to XLSX works inside your browser. Your files are not uploaded anywhere, so nobody else can see them, and there are no waiting queues.

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