XLSX to CSV
Choose a worksheet and delimiter, preview the data, then convert your spreadsheet into a downloadable CSV — free, private, and processed entirely in your browser.
About the XLSX to CSV Converter
Spreadsheets are great for editing, but many tools — scripts, databases, import forms — expect the plain, universal CSV format instead. Our free online XLSX to CSV converter turns an Excel spreadsheet into CSV, letting you pick exactly which sheet to export and preview the data before you download.
Unlike most online tools, parsing happens entirely inside your browser using the SheetJS library — your spreadsheet is never uploaded to a server. That means it's fast, works without an internet round-trip, and keeps your data completely private and secure.
How to Convert XLSX to CSV
Step 1
Upload your spreadsheet
Drag and drop an XLSX or XLS file, or choose one from your device.
Step 2
Choose a sheet and format
Pick which sheet to export (or all of them), your delimiter, and whether to keep the header row.
Step 3
Download your CSV
Save the converted file — or a ZIP of all sheets if you exported more than one.
Frequently Asked Questions
Can I convert just one sheet, or all of them at once?
Both. Pick a single sheet to download as one CSV file, or choose 'All Sheets' to get every sheet converted and packaged into a single ZIP file.
Can I preview my data before converting?
Yes. Once you select a sheet, the tool shows a preview of its first 20 rows so you can confirm it's the right data before downloading.
Can I change the delimiter used in the CSV file?
Yes. Choose between a comma, semicolon, tab, or pipe character as the delimiter, and toggle whether the first row's headers are included.
Is my spreadsheet uploaded to a server to convert it?
No. The entire conversion happens locally in your browser using the SheetJS library. Your spreadsheet is never uploaded anywhere.