Convert CSV to Excel (XLSX) Online
To convert a CSV file to Excel online, upload your CSV to Large CSV Viewer and choose Export → Excel from the File menu. A properly formatted XLSX file downloads immediately. No Excel installation is required, there is no file size limit, and the conversion is completely free. The XLSX output is compatible with Microsoft Excel, LibreOffice Calc, and Google Sheets.
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Need an Excel file from a CSV? Large CSV Viewer converts your CSV to a properly formatted XLSX file in one click. You can also filter or sort the data first, so your Excel file contains exactly what you need.
Key features
- One-click CSV to XLSX conversion
- Filter and sort before exporting to Excel
- No Excel installation required on your machine
- Works on Windows, Mac, Linux, and Chromebooks
How it works
- Upload your CSV. Open your CSV file in the viewer. Any file size is supported — from a few rows to millions.
- Clean and filter (optional). Remove unwanted rows using column filters, hide columns you don't need, or sort the data before converting.
- Export as Excel. Open the File menu and select 'Export dataset as Excel'. A properly formatted .xlsx file downloads immediately.
Frequently asked questions
Is the XLSX output compatible with Excel and Google Sheets?
Yes. The exported XLSX file opens correctly in Microsoft Excel, LibreOffice Calc, and Google Sheets.
Does the Excel file preserve all my edits?
Yes. Any inline edits and find-and-replace changes are included in the exported XLSX file.
Can I convert a large CSV to Excel?
Yes, though note that Excel itself has a 1,048,576 row limit. If your CSV exceeds this, the XLSX export will include all rows but Excel may truncate the display.
Is the CSV to Excel conversion free?
Yes, completely free. No account, no size limit, no paywall.
Can I convert CSV to Excel on a Mac?
Yes. The converter runs in your browser and works identically on macOS, Windows, Linux, and Chrome OS.