Private browser file tool
Convert CSV to XLSX
Turn a CSV file into an Excel-compatible XLSX workbook locally in your browser.
Your spreadsheet stays on this device. File bytes and converted workbook data are not sent to a FigureNest conversion server.
Choose a file
Selected files are handled in memory by FigureNest local-processing tools. This shared foundation contains no upload path.
Up to 75 MB. UTF-8 CSV input only; workbook shape limits are enforced before XLSX export.