XLSX and CSV converter

How to convert XLSX to CSV and back

Drop the file onto the area. The extension tells us which way to go: XLSX becomes CSV, CSV becomes an XLSX workbook. Nothing is uploaded, the conversion happens right in your browser.

• Separator: a comma is what English-language Excel and most web apps expect, a semicolon is what Excel opens directly in many European locales, and a tab suits text editors.
• Accents: CSV is saved as UTF-8 with a BOM. Without it Excel turns “Zürich” into “Zürich”.
• Multiple sheets: CSV holds one table only, so a workbook with several sheets comes back as a ZIP with one file per sheet.

Frequently asked questions

What happens to formulas?

Their calculated result goes into the CSV, because CSV knows nothing about formulas. Converting the other way, a cell starting with an equals sign is stored as a formula.

Is formatting preserved?

Not in CSV, which holds text only. Numbers, currency, percentages and dates are written exactly as you saw them in the table, though. Converting to XLSX, the format is recognised again from the way the value is written.

Do you send the data to a server?

No. The file is read and rebuilt in the browser, so you can convert payroll or revenue tables just as safely.

Will the result open in Excel?

Yes, XLSX is the ordinary Office Open XML format. A comma-separated CSV opens with a double click in most English installations; with a semicolon, use Data → From Text.

I need to change something in the file, can I?

Yes, one button opens our spreadsheet editor, where you can edit the file and download it again.