Excel (XLSX) to CSV Converter
Export every sheet to CSV — in your browser
To convert XLSX to CSV, drop your Excel workbook above, choose every sheet or just the first, and click Convert to CSV. Fylo exports the displayed cell values of each sheet as a separate CSV file using SheetJS in your browser — ready for databases, imports and scripts. Nothing is uploaded.
Drop documents here
or tap to browse · paste with Ctrl+V · add many at once
Your files never leave your device
How to convert XLSX to CSV
Add XLSX files
Drop one or more Excel workbooks.
Choose sheets
Every sheet (one CSV each) or the first sheet only.
Convert and download
Click Convert to CSV; multiple sheets download as a ZIP.
When you need CSV
Database imports, CRMs, email marketing tools, analytics platforms and programming languages all speak CSV. Converting from Excel removes formulas, formatting and charts, leaving just the values — exactly what import tools expect.
What's exported
Each sheet is saved as its own CSV named after the workbook and sheet. Formulas are exported as their calculated values, using the number formatting shown in Excel. Empty trailing rows are skipped. Merged cells keep their value in the top-left cell only, and charts and images aren't exported.
Character encoding
Fylo saves CSV as UTF-8, so names with accents and non-Latin scripts are preserved. Some older versions of Excel assume a different encoding when opening CSV directly; if text looks garbled in Excel, use Data → From Text/CSV and choose UTF-8, or simply import the file into your database or tool, which almost always expects UTF-8.
Learn more: XLSX format guide · CSV format guide
| Property | XLSX | CSV |
|---|---|---|
| Type | Spreadsheet workbook | Plain-text table |
| How it's stored | ZIP of XML files | None (plain text) |
| Keeps formatting | Yes — formulas, formats, multiple sheets | No — values only |
| Compatibility | Excel, Google Sheets, LibreOffice, Numbers | Universal: spreadsheets, databases, code |
| Best for | Calculations, data with formatting, multiple sheets | Importing and exporting data |
| Introduced | 2007 | 1972 (RFC 4180 in 2005) |
Frequently asked questions
Are formulas kept?
No — CSV holds values only, so each formula's last calculated result is exported.
Can I export all sheets at once?
Yes, choose Every sheet; you'll get one CSV per sheet.
Which delimiter is used?
Commas, with quotes around values that contain commas or line breaks.
Does it work with .xls files?
This tool is tuned for .xlsx; older .xls may work but isn't guaranteed.
Are my files uploaded to a server?
No. XLSX to CSV runs entirely in your browser — your files are processed on your own device and never sent anywhere. Once the page has loaded, it even keeps working if your connection drops.
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