Merge Excel joins several Excel, ODS or CSV files into one workbook. Keep each file as its own sheet, or stack all the rows into one sheet with the columns matched by their names and a column that shows which file each row came from.
No. The file is opened and changed inside your browser, on your phone or computer. Nothing is sent to our servers.
No. With "Files share a header row" ticked, columns are matched by their names.
Values, formulas, dates and sheet names are kept. Colours, borders, merged-cell styles and charts may not carry over, because the file is rebuilt in your browser.
Yes. Merge Excel works inside your browser. Your files are not uploaded anywhere, so nobody else can see them, and there are no waiting queues.