Remove duplicates in Excel finds repeated rows and keeps only the first one. Compare every column, or only the columns you choose, like a phone number or email, and ignore differences in capital letters and spaces.
No. The file is opened and changed inside your browser, on your phone or computer. Nothing is sent to our servers.
Yes. Tick "Put the removed rows on a separate sheet".
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. Remove duplicates in Excel works inside your browser. Your files are not uploaded anywhere, so nobody else can see them, and there are no waiting queues.