XLS to CSV
Convert Excel spreadsheets (.xls, .xlsx) to CSV online quickly and for free.
How it works
The tool uses the SheetJS library to read Excel spreadsheet content directly in the browser. The first block of rows is used as the header and data is converted to CSV format with the chosen delimiter.
Facts about XLS to CSV Conversion
- CSV (Comma-Separated Values) is a widely supported plain text format.
- The conversion is performed entirely in the browser, with no data sent to external servers.
- Duplicate headers are automatically renamed (e.g. name, name_2, name_3).
- The CSV format follows RFC 4180 with commas as the default separator.
Official references
Consult the specifications of the formats used:
- ECMA-376 — Office Open XML File Formats: The official .xlsx format standard.
- RFC 4180 — Common Format and MIME Type for CSV: The official CSV file format.