Remove Duplicate Lines
Remove duplicate lines from any text. Case-sensitive options, sort results, show occurrence counts, find-only-duplicates mode.
How to use the Duplicate Line Remover
Paste your text
Paste any text with duplicate lines. The tool works on a line-by-line basis — each line is compared to all others and duplicates are removed, keeping the first occurrence. By default, comparison is case-sensitive so "Apple" and "apple" are treated as different. Tick "Case insensitive" to match them.
Options
Trim whitespace removes leading and trailing spaces before comparison, so lines that differ only in spacing are treated as duplicates. Sort result arranges the output alphabetically. Show occurrence count adds a number before each line showing how many times it appeared in the original.
Find which lines are duplicated
Tick "Show ONLY duplicates" to reverse the logic — instead of removing duplicates, it shows only the lines that appeared more than once. This is useful for auditing lists to find which items are repeated, or for data cleaning when you want to investigate duplicates before removing them.
Frequently asked questions
Is the Duplicate Line Remover free to use?
Yes, the Duplicate Line Remover is completely free. There is no sign-up, no account required, and no limit on how often you can use it.
Is my text private when using the Duplicate Line Remover?
Yes, all text processing happens in your browser. Your text is not sent to any server and is not stored anywhere outside your device.
What devices does the Duplicate Line Remover work on?
The Duplicate Line Remover works on any device with a modern web browser — desktop, laptop, tablet, or phone. It is mobile-friendly and works offline once the page has loaded.