Remove Duplicate Lines
Paste a list of lines and remove duplicates instantly — nothing sent to a server.
Original lines
0
Unique lines
0
Removed
0
How to remove duplicate lines
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1
Paste your list
Drop your lines into the left box, one item per line.
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2
Choose your options
Toggle case-sensitivity, whitespace trimming, or empty-line removal to match your list.
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3
Remove duplicates & copy
Click "Remove duplicates", then "Copy result" to grab the cleaned list.
Example use cases
Email & contact lists
Clean up a list of addresses before importing it into another tool.
Keyword & tag lists
Dedupe keyword research or hashtag lists before use.
Log files & data exports
Strip repeated lines from exported logs or CSV-like text.
To-do & inventory lists
Merge multiple lists into one without repeated entries.
Frequently asked questions
Which line is kept when there's a duplicate?
The first occurrence of each line is kept, and later duplicates are removed, preserving the original order of the remaining lines.
What does "trim whitespace before comparing" do?
It ignores leading and trailing spaces when checking whether two lines match, so " apple" and "apple" are treated as duplicates. The output still keeps the original spacing.
Can I remove duplicates without ignoring case?
Yes — turn on "Case-sensitive" and "Apple" and "apple" will be treated as different lines.
Is my text sent to a server?
No. Duplicates are removed entirely in your browser — nothing is transmitted or logged.