How it works
Add your Excel workbook file. MimiFile checks the format, converts it to Microsoft Excel 97–2003, and provides a temporary download when the result is ready.
Convert modern XLSX to older XLS when a legacy Excel-compatible application or business system specifically requires the Excel 97–2003 format.
XLSX → XLS
Drag and drop, paste a file, or browse your device.
Files are temporary and deleted automatically.
Limits: 90 MB per file · 128 MB total per batch.
Add your Excel workbook file. MimiFile checks the format, converts it to Microsoft Excel 97–2003, and provides a temporary download when the result is ready.
XLS has older limits and a different feature model than XLSX. Keep the XLSX source and review formulas, charts, formatting, names and workbook size before depending on the legacy copy.
Current source limit : 90 MB per file. Up to 10 files can be submitted in a batch, subject to the global batch ceiling.
Excel workbook is accepted here as application/vnd.openxmlformats-officedocument.spreadsheetml.sheet. The current source-file limit is 90 MB.
The result is produced as Microsoft Excel 97–2003 (application/vnd.ms-excel). Features unsupported by the destination format cannot be preserved.
Use this when a service, device or workflow accepts Microsoft Excel 97–2003 but your source file is Excel workbook.
Excel workbook and Microsoft Excel 97–2003 can represent document structure differently. MimiFile imports the Excel workbook source through its isolated office-processing pipeline and writes a new Microsoft Excel 97–2003 result rather than merely renaming the extension.
Excel workbook is a workbook format that can contain cells, formulas, number formats, multiple sheets, charts and print settings.
Microsoft Excel 97–2003 is intended for editable spreadsheet workbooks. Formula syntax, charts, external links and application-specific formatting should be checked after migration.
When moving between XLS, XLSX and ODS, verify formulas, number/date formats, charts, named ranges, external links, conditional formatting and application-specific functions. The conversion is performed with an isolated headless LibreOffice profile. Features that have no equivalent in the destination format can be changed, flattened or omitted.
Check formulas, calculated values, number/date formats, sheet names, hidden sheets, charts, column widths and print settings.
The downloaded file uses Microsoft Excel 97–2003. Check the result if the source contains transparency, animation, embedded fonts, metadata or other format-specific features.