XLSX ↔ CSV Converter
Convert between XLSX workbooks and CSV files preserving sheets and encoding. Move data across Excel and pipelines — local SheetJS work, unlimited saves.
Runs on SheetJS
How to Use the XLSX ↔ CSV Converter
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Frequently Asked Questions
Multiple sheets?
One sheet per run — pick it in the Sheet dropdown (first sheet by default); multi-sheet workbooks need one pass each. Preview shows the first 20 rows; row ranges cap at All, 1–100, 1–500, or 1–1000; delimiters span comma, tab, semicolon, and pipe.
Encoding issues?
UTF-8 CSV out with no BOM; formulas export as computed values. Verify accented text after converting.
CSV back to XLSX?
Yes — CSVs combine into worksheets with type inference. Formatting rebuilds manually; data transfers exactly.
Are workbooks uploaded?
No — conversion runs locally in your browser with SheetJS. Saves never touch a meter — downloads on local tools are unlimited.
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Last updated October 2026