87 free tools for Excel and CSV files.Your files are processed in this browser and never sent to a server, so there is nothing to install and no limit on how often you use them.

ODS to XLSX converter

Convert xls, xlsb, ods and Numbers files to xlsx, many at once. Values, formulas, merged cells and sheet names carry over; colors and borders do not, and you see that before converting. Your file is processed inside this browser and never uploaded.

File 1

Choose several xls, xlsb, ods, Numbers or CSV files at once

Drop a file hereChoose file.xlsx / .xls / .ods / .csv, up to 20 MB