Excel to CSV Converter
Convert .xlsx and .xls workbooks to CSV — one CSV per sheet, bundled into a ZIP.
Quick answer: Convert .xlsx and .xls workbooks to CSV — one CSV per sheet, bundled into a ZIP.
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Frequently asked questions
- Will my formulas survive?
- No — CSV has no formula concept. We export the current value of each formula cell, which is what every other Excel-to-CSV tool does too.
- What about formatting (colours, borders, bold)?
- CSV is a plain-text format and has no styling. Visual formatting is dropped; values are preserved exactly.
- How are dates exported?
- As ISO 8601 (YYYY-MM-DD or YYYY-MM-DDTHH:MM:SS) — the format Excel imports back cleanly without locale ambiguity.
- Are my files uploaded?
- No — SheetJS runs entirely in your browser. Even confidential financial data is safe.
- What about merged cells?
- Merged cells expand to repeated values across the merge range, so the resulting CSV is rectangular and works in every downstream tool.