CSV to XLS Converter
Export CSV values as XLS for compatible data exchange.
Converted in your browser. Your file never leaves your device.
Drop your CSV files here
or drag and drop · 10 MB per file
How to convert CSV to XLS
- Choose CSV files up to 10 MB.
- Use UTF-8 text with a header row; record exports need unique, nonempty column names.
- Review the report and download the XLS file.
Where this file comes from
Database exports and spreadsheet downloads use CSV for rows separated by commas.
What changes in the conversion
XLS is useful for legacy Excel readers. This tool creates an Excel 97-2003 values-only workbook with up to 256 columns per sheet.
The table becomes one worksheet. Every cell is stored as text, preserving leading zeros, date text, and formula-like strings. Delimiters and quoting are replaced with spreadsheet cells. No formulas, styles, or number formats are inferred.
Size limits and browser notes
- Accepts .csv files up to 10 MB each.
- You can convert several files at once; they download together as one ZIP.
- Everything runs in your browser, so very large files depend on your device's memory.
Runs in a browser worker. Limits: 10 MB input, 100 MB expanded container, 50 worksheets, 50,000 rows, 256 columns, and 100,000 selected cells. Encrypted and damaged files are rejected. Spreadsheet styling and recalculation are not supported.
FAQ
What does CSV to XLS keep?
XLS is useful for legacy Excel readers. This tool creates an Excel 97-2003 values-only workbook with up to 256 columns per sheet.
Will formula-like strings run?
No. Strings beginning with an equals sign are stored as text. This converter does not create spreadsheet formulas.
Will my file be uploaded?
No. The converter and its libraries run in your browser. File contents and names are not sent to a server.
Related tools
See every tool on the Spreadsheet & Data Converter page.