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.