Remove duplicate lines

Remove duplicate lines

Remove duplicate lines from any list while keeping the first occurrence and the original order. Great for cleaning up email lists, logs, keyword lists and CSV columns. It runs entirely in your browser — your data stays private.

How it works

Each line is compared exactly (including spaces and case). The first time a line appears it is kept; later identical lines are dropped. The tool also tells you how many duplicates were removed.

Frequently asked questions

Is the order preserved? Yes — the first occurrence of each line stays in place.

Is it case-sensitive? Yes, lines that differ only in capitalisation are treated as different.