Know your formats
Supported formats and limitations
- Input formats
- XLSX
- Output formats
- CSV
- CSV keeps stored values. Number and date formatting, styles, charts and other worksheets are omitted. Numeric precision reflects the workbook’s stored values.
- Formula results use the saved cache, which may be stale or empty. Formula-like CSV values get a leading apostrophe.
The CSV contains stored values from one worksheet, with quotes around fields that need escaping. Spreadsheet date formats become their underlying serial values when stored numerically. Formula cells use saved cached results, which can be stale or empty. Formula-like export text receives a disclosed leading apostrophe.
Maximum input size is 8 MiB per file.
A local workflow
How to use this converter
Your file contents stay in the browser as you work.
Select the XLSX workbook.
Choose a worksheet.
Download its CSV export and review any safety notices.
A little more clarity
Frequently asked questions
Why does a date appear as a number?
Spreadsheet dates are often stored as numeric serials. CSV export preserves the stored number, while ISO date cells keep their date text.
Is XLSX to CSV available now?
This tool runs locally with JavaScript enabled. Check its supported formats and size limits before converting.