Duplicates check

Paste a list or a block of rows from Excel. See which values repeat, how many times and on which lines, then copy a clean version without the duplicates.

Runs entirely in your browser. Nothing you paste is uploaded.
IN

Your data

DUP

Repeated values

0
OUT

Line numbers count from the first line you pasted, so they match Excel row numbers when you copy from row 1. With “Ignore upper/lower case” on, ACC-10021 and acc-10021 count as the same value. Other spellings are listed under each value. Blank cells are skipped. Copied rows keep all their columns, and the header row stays on top.