Convert XLSX to XLS
Convert XLSX files to XLS locally, completely free and with maximum privacy.
Drag and drop your files here
or click to browse local files (large files supported, limited only by browser RAM)
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How to convert XLSX to XLS
- Drop your .xlsx files above, or click Upload Files. You can add many files at once.
- XLS is already selected as the output. Open the settings (gear icon) to fine-tune the result.
- Click Convert All. SheetJS runs inside your browser through WebAssembly; nothing is uploaded.
- Download your .xls files as soon as each one finishes.
What to know about XLSX to XLS conversion
- Cell values, number formats and sheet names carry over. Formulas are saved as their last calculated values in XLS, and cell styling, charts and macros are not preserved.
- XLS is best for compatibility with Excel 97–2003 and legacy systems, and opens in Excel, LibreOffice and Google Sheets.
XLSX vs XLS
| Feature | XLSX (Excel Workbook) | XLS (Excel 97-2003 Workbook) |
|---|---|---|
| Multiple sheets | Yes | Yes |
| Formulas and formatting | Yes | Yes |
| Best for | everyday spreadsheets shared with Excel users | compatibility with Excel 97–2003 and legacy systems |
| Opens in | Excel, Google Sheets, LibreOffice and Numbers | Excel, LibreOffice and Google Sheets |
XLSX (Excel Workbook): The default Microsoft Excel workbook format since Office 2007, based on Office Open XML.
XLS (Excel 97-2003 Workbook): The legacy binary Microsoft Excel format (BIFF8), still common in older systems.
Conversion options
- Active sheet only or all sheets
- Custom output file name
Frequently asked questions
Is it safe to convert XLSX to XLS here?
Yes. Your files are processed entirely on your own device by WebAssembly code running in the browser. They are never uploaded, so nobody else can see them, and the converter keeps working even if your connection drops after the page loads.
Is there a file size limit?
There is no server-side limit. The only limit is the memory available to your browser, typically 1.5–4 GB on desktop computers.
Can I convert several XLSX files at once?
Yes. Add as many files as you like; they are converted in parallel according to your device's CPU cores, and you can apply the same settings to all of them.
Related conversions
Need the opposite? Convert XLS to XLSX.
Convert XLSX to other formats
Convert other formats to XLS
See every XLSX converter and XLS converter, or browse the full converter directory.