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Paste a CSV or open the file, and rows that repeat exactly are removed — with a count of how many went, so you can sanity-check the result. Sort by any column while you’re at it, as text or as numbers. Only identical rows are treated as duplicates; two rows that differ by a space or a capital letter both stay.
Paste a CSV, or open a .csv file.
Everything happens in this tab — nothing is uploaded, and closing the page discards it all. Cells are treated as text from start to finish, never coerced to numbers, so postal codes, part numbers and leading zeros survive untouched. Merge appends rows as they are; it doesn’t reconcile files whose columns differ.
Paste into the editor or open a file — everything you add stays in this tab, and you see exactly what the tool will work on before anything runs.
Your browser does all the work locally. Nothing is uploaded — what you paste never leaves this tab, so there’s nothing for anyone to store, scan, or leak.
Take the result to your clipboard, or save it as a file. Close the tab and nothing of what you pasted remains.