Excel Data Cleaner

Select the data, go to Data → Remove Duplicates, choose the columns that define a duplicate and confirm. This cleaner does the same job before the data enters Excel, and lets you compare case-insensitively.

In Excel, TRIM removes leading, trailing and repeated spaces, while CLEAN removes non-printing characters. Line breaks inside a cell need SUBSTITUTE(A1,CHAR(10)," "). This tool applies all three in one pass without formulas.

No. Cleaning runs entirely in your browser. Nothing is transmitted, which makes the tool safe for customer lists, payroll extracts and other confidential data.

A UTF-8 CSV with a byte-order mark, so Excel opens accented characters and non-Latin text correctly. Choose comma, semicolon or tab as the delimiter before downloading.