Can I convert all sheets in a workbook at once?

Yes. Multi-sheet workbooks produce a separate CSV file per sheet, delivered as a ZIP archive.

Are Excel formulas preserved?

No. CSV is a plain text format. Formulas are replaced with their calculated values.

Comma by default. You can choose semicolon or tab delimiter in the options panel.

UTF-8 with BOM for maximum compatibility with Excel.

5MB on free, 50MB on Pro, 200MB on Business.

SPREADSHEET

Convert XLSX or XLS spreadsheets to CSV instantly in your browser. Handles multiple sheets — no upload, no account needed.

Files never uploadedInstant conversionNo account needed

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1Drop your XLSX / XLS file onto the converter above, or click to browse and select a file.
2Adjust any conversion options such as output format, quality, or delimiter settings.
3Click the Convert button. The file is processed instantly in your browser.
4Download your converted CSV file. Your original file is unchanged.

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Your files never leave your device. All processing happens in your browser using WebAssembly.

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No upload wait times, no server queues. Conversion starts immediately and completes in seconds.

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Single-file conversion is always free with no account required. Upgrade for batch processing and more.

Can I convert all sheets in a workbook at once?: Yes. Multi-sheet workbooks produce a separate CSV file per sheet, delivered as a ZIP archive.
Are Excel formulas preserved?: No. CSV is a plain text format. Formulas are replaced with their calculated values.
What delimiter does the CSV use?: Comma by default. You can choose semicolon or tab delimiter in the options panel.
What encoding is used?: UTF-8 with BOM for maximum compatibility with Excel.
What's the file size limit?: 5MB on free, 50MB on Pro, 200MB on Business.