Convert modern XLSX files to legacy XLS format for compatibility with Excel 97-2003. Perfect for sharing spreadsheets with users who have older Excel versions. Batch process multiple files. No signup, secure, and free.
Follow these easy steps to downgrade your modern Excel files to legacy XLS format:
Click the upload area or drag and drop your modern .xlsx files. Selected files appear in the order they'll be converted.
Drag and drop files in the list to rearrange them. The order determines the sequence of converted XLS files.
Once files are arranged, click the Convert to XLS button to start downgrading your Excel files.
Download your converted legacy XLS files. All original XLSX files are automatically deleted from our servers for your privacy.
Pro Tip: XLS format is compatible with Excel 97-2003 and older spreadsheet applications. However, note that XLS has limitations: maximum 65,536 rows and 256 columns. Files exceeding these limits will be truncated.
Our XLSX to XLS converter helps you downgrade modern Excel spreadsheets to the legacy binary format. XLS files ensure compatibility with older versions of Microsoft Excel (97-2003) and legacy applications that don't support the newer Open XML format. No installation, no signup, just fast and secure conversion.
We ensure accurate downgrade while preserving maximum compatibility:
| Formula conversion: Basic formulas preserved, advanced functions simplified | Data preservation: All cell data and values retained |
| Formatting support: Basic cell formatting preserved | Feature limitations: Tables, slicers, advanced charts simplified |
| Batch efficiency: Process multiple files simultaneously | Secure transfer: HTTPS encryption throughout |
| Auto-delete: Files removed after 1 hour | Compatibility: Works with Excel 97-2003 and older |
Share files with organizations still using older Excel versions (97-2003).
Import data into legacy business systems that only accept XLS format.
Ensure students with older software can access course materials.
Store files in widely compatible XLS format for long-term preservation.
Share spreadsheets with partners who may not have updated software.
Prepare data for migration to systems that require XLS format.
| Feature | XLSX (Modern) | XLS (Legacy) |
|---|---|---|
| Maximum Rows | 1,048,576 | 65,536 |
| Maximum Columns | 16,384 | 256 |
| File Format | Open XML (ZIP-based) | Binary (BIFF) |
| File Size | Compressed, smaller | Larger |
| Advanced Features | Tables, slicers, timelines | Limited support |
| Compatibility | Excel 2007+ | Excel 97-2003+ |
Downgrade your modern Excel files to the legacy XLS format. Perfect for ensuring compatibility with older Excel versions and legacy systems.