How it works
- 1Choose the required file or enter the source data.
- 2Set the available options and run the tool.
- 3Download the generated result.
← All tools
BROWSER · SheetJS CE 0.20.3
XLSX to XLS
Use XLSX to XLS directly in your browser. Your files stay on your device and are processed locally.
✓ Browser-based processing✓ Files stay on your device✓ No account required
Choose an XLSX fileClick or drag and drop
Legacy XLS (BIFF8) has stricter worksheet and row limits than XLSX. Very large modern workbooks may not fit.
No file selected.
About this tool
XLSX to XLS runs in the browser using SheetJS CE 0.20.3. The selected data is processed locally and is not uploaded to this site.
Frequently asked questions
Are my files uploaded?
No. Processing is performed locally in your browser.
Do I need to install software?
No. The tool runs in a modern web browser.