CSV duplicate remover
Upload a list, choose the columns that identify a person or company, review the duplicate clusters, and download a clean file with a full audit trail.
1. Add your list
CSV, TSV or XLSX. Processed on our server so large files work — Free plan: up to 1,000 rows per file, no signup needed to try.
Compare two lists (Starter & Pro)
Upload your master list and a new list. We split the new list into records that are new, records missing from it, and records whose details changed — matched on the key columns you name. Both files must use the same key column names.