Remove Duplicate Lines
This free duplicate line remover cleans any list in one paste: keyword exports, log files, email lists, CSV columns, code imports — every repeated line is dropped and only the first occurrence is kept, in its original order.
How to use
- Paste your list or text into the editor below — one entry per line.
- Optionally enable ignore case and whitespace trimming.
- Read the deduplicated result and the counters: input lines, unique lines, duplicates removed.
- Copy the cleaned list; the tool keeps the first occurrence of every line.
Frequently asked questions
Does the order of my lines change?
No. The tool keeps the first occurrence of every line and preserves the original order throughout. Lines are never shuffled or re-sorted; use the line sorter if you additionally want ordering.
What does the ignore case option do exactly?
It makes the comparison case-insensitive: "Apple", "APPLE" and "apple" all count as duplicates of each other. The first form you typed is the one kept, so the output preserves whichever capitalization appeared first.
When should I enable whitespace trimming?
Enable it when your data came from spreadsheets, terminals or PDFs where stray spaces sneak in. With trimming on, " item " and "item" are treated as the same line, and output lines are cleaned of leading and trailing spaces.
Are empty lines treated as duplicates?
Yes — two empty lines are duplicates of each other, so only the first one survives, just like any other repeated line. Give the text a quick look before copying if blank separators matter to your format.
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About this tool
This free duplicate line remover cleans any list in one paste: keyword exports, log files, email lists, CSV columns, code imports — every repeated line is dropped and only the first occurrence is kept, in its original order. Paste your text and the deduplicated result appears instantly together with three counters showing input lines, unique lines and how many duplicates were removed, so you can trust the result at a glance. Two optional switches handle the messy reality of copied data: ignore case treats "Apple", "APPLE" and "apple" as the same line while keeping the first form it saw, and trim ignores leading and trailing whitespace so " [email protected] " and "[email protected]" collapse into one entry. Everything is computed locally in your browser as you type — your lists never touch a server, which matters for customer emails, private logs and anything else you would rather not paste into a random website. Adjust the switches and the result re-runs immediately.