XLS → CSV
Extracts the first worksheet of legacy XLS files to CSV, feeding exports from legacy systems into modern data pipelines.
Drag files here or click to upload (multiple files supported)
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How to convert XLS to CSV
- 1Upload your XLS file by dragging, clicking, or pasting.
- 2Adjust quality settings if needed.
- 3Click 'Convert Now' and wait for the conversion to complete.
- 4Download your converted CSV file.
About XLS to CSV conversion
XLS is the BIFF8 binary table format used by Excel 97-2003, with a 65536 row limit per single worksheet, and is mostly used in legacy systems. CSV is a plain text comma-separated format following RFC 4180 standard, it has no multi-worksheet structure, all data is stored as strings, and is a general format for mutual import and export between databases and spreadsheets.
The conversion outputs a plain text file, which is usually smaller than the original XLS file. It can only output content from a single worksheet, retains calculation results of original formulas, automatically infers cell data formats and outputs strings, and does not retain cell style and formatting information from the original XLS.
This conversion is suitable for workflows that require importing XLS tables into databases, adapting to open source data processing tools that cannot read binary XLS, or processing table data in old Linux command line environments. You need to select the worksheet to export during conversion.
XLS vs CSV: technical comparison
| Feature | XLS | CSV |
|---|---|---|
| Released | 1987 | 1972 |
| Developer | Microsoft | RFC 4180 |
FAQ about XLS → CSV
Will data be distorted after conversion
Basic table data can be fully preserved. Only numeric and date values are converted to strings in corresponding formats. Multi-worksheet and cell styles are not retained, which does not affect conventional data import use.
Are multiple worksheets preserved
CSV does not support multi-worksheet structure. Only a single worksheet can be selected for export during conversion. Content from other worksheets is discarded and not stored in the output file.
What file size is supported
The single file conversion limit on this site is 50MB. If the total uncompressed size after conversion exceeds 256MB or the number of files exceeds 1000, the server will reject processing.
Are files retained
Files are uploaded to the server via HTTPS for conversion. After conversion is complete, the server immediately deletes both the source file and the output file, and does not store any files.