Excel to CSV Converter

What this tool does

Excel to CSV Converter reads an uploaded .xlsx workbook and converts each sheet into its own CSV file, previewed in the browser and downloadable individually or, when there are multiple sheets, all together as a single ZIP.

CSV is the universal, simplest format for tabular data, but it has no concept of multiple sheets the way an Excel workbook does, converting a multi-sheet .xlsx file means deciding what happens to each sheet individually.

This converter reads an uploaded workbook and produces one CSV file per sheet, previewed directly in the browser, downloadable individually, or all together as a single ZIP when the workbook has more than one sheet, all processed entirely client-side.

How to use Excel to CSV Converter

1. Choose a .xlsx file to convert.
2. Review the preview of each sheet’s resulting CSV.
3. Download an individual sheet’s CSV, or Download all sheets as ZIP.
4. Re-upload a different workbook at any time to convert something else.

Tips for better results

• Each sheet becomes a completely independent CSV file, formulas are converted to their last-calculated values, not their formula text, since CSV has no concept of formulas.
• Cell formatting, colours, merged cells and charts aren’t preserved, CSV is pure, unformatted tabular data only.
• A workbook with just one sheet downloads directly as a single CSV; multi-sheet workbooks offer the convenient "download all as ZIP" option.
• Dates in the source workbook are converted to ISO 8601 format in the CSV output, a safe, unambiguous standard that avoids regional date format confusion.

Common use cases

• Converting an Excel export into CSV for importing into another system that only accepts CSV.
• Extracting one specific sheet’s data from a larger multi-sheet workbook as a standalone file.
• Preparing Excel data for a script or database import expecting plain CSV.
• Converting a workbook for version control or diffing, since CSV is plain text and diffs cleanly.

Common mistakes to avoid

• Expecting cell formatting, formulas, or charts to carry over into the CSV, those are all Excel-specific features with no CSV equivalent, only the calculated values transfer.
• Forgetting a multi-sheet workbook produces multiple separate CSV files, not one combined file, each sheet is independent in CSV’s tabular model.
• Assuming merged cells convert sensibly, a merged cell’s value typically appears only in its top-left CSV cell, with the other cells it spanned left empty.