Remove Duplicate Lines
Delete repeated lines from a list while keeping the original order.
Keeps the first occurrence of every line and drops the rest, preserving the original order. Runs entirely in your browser.
How to remove duplicate lines
Paste your list — one item per line — into the box. Duplicates are removed instantly in the output below. Toggle Trim whitespace and Case sensitive to control how closely two lines must match. Click Copy result to grab the cleaned list.
When to dedupe a list
Cleaning up email lists, keyword lists, log lines, CSV columns or any export that has accidental repeats. Removing duplicates before importing keeps counts honest and avoids double-processing.
Questions
Does it keep the original order of my list?
Yes. The tool keeps the first time each line appears and drops every later copy, so the surviving lines stay in their original order rather than being sorted.
What do the Trim and Case-sensitive options do?
Trim whitespace ignores leading and trailing spaces when comparing, so "apple" and " apple " count as the same. Case sensitive, when off, treats "Apple" and "apple" as duplicates too.