CSV to XLSX
Make a spreadsheet app-friendly .xlsx from a plain CSV — processed locally.
CSV to XLSX
Turn a comma-separated CSV into a real Excel .xlsx workbook, in your browser.
Result
Your .xlsx file will appear here.
Will my CSV formatting be preserved?
Values are read into cells exactly as they appear, with the first row treated as a header by most spreadsheet apps. Formulas and styling from the original CSV don't exist (CSV has none), but the data itself is carried over faithfully.
Will my formulas survive a CSV to XLSX conversion?
No — CSV stores only raw values, never formulas. This tool writes the values into real Excel cells; if you need live formulas, add them after opening the file in Excel or Sheets.
Why convert CSV to XLSX at all?
XLSX keeps types (dates, numbers), multiple sheets, and formatting that CSV loses. Converting locally also avoids uploading sensitive rows to a web service.