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CSV to XLSX: convert CSV to an Excel file
Upload your CSV and download it as an .xlsx file that opens in Excel.
Drag and drop a CSV file here
Your file never leaves this browser.
Why use this CSV to XLSX tool?
- A real Excel file. The output is a genuine .xlsx file you can format in Excel right away.
- Preview before download. Check a few rows before you convert.
- Private by design. Your browser converts the file. Nothing uploads.
How to convert CSV to Excel
- Upload your CSV file.
- Check the preview that appears.
- Click Download .xlsx to save the file.
When you need this tool
Your data sits in CSV, but a coworker or client asks for an Excel file they can format, color, and add formulas to.
Some systems accept only .xlsx uploads, so you convert the CSV first.
Frequently asked questions
Does the XLSX file open in Excel and Google Sheets?+–
Yes. The .xlsx file uses the standard modern Excel format and opens in Excel, Google Sheets, and LibreOffice Calc.
Does the tool detect numbers and dates as data types?+–
The tool writes each value as plain text from the CSV. Excel usually still detects numbers, but you may need to reformat custom date formats by hand in Excel.
Is there a file size limit?+–
No official limit. A very large file, with hundreds of thousands of rows, slows the conversion because your browser does all the work.
Is my data uploaded to a server?+–
No. The conversion runs in your browser.