What Is the Duplicate Line Remover?
The Duplicate Line Remover processes multi-line text and removes repeated lines, keeping only the first occurrence of each unique line. Options: case-sensitive matching (default), case-insensitive matching (treats "Hello" and "hello" as duplicates), and sorted output (alphabetizes the deduplicated list).
How to Use It
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Common Uses
Deduplicating keyword lists, tag lists, or hashtag collections. Cleaning CSV/TSV data with repeated rows. Removing duplicate entries from collected text data. Deduplicating email lists before import. Cleaning up any list where duplicates were accidentally entered.
Frequently Asked Questions
Does the duplicate remover work on case variations?
By default, matching is case-sensitive — "Hello" and "hello" are treated as different lines. Enable case-insensitive mode to treat all case variations as duplicates.
Does it preserve the original line order?
Yes. The first occurrence of each line is preserved in its original position. Subsequent duplicate occurrences are removed. The output maintains the original order of first appearances.