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Frequently Asked Questions
The duplicate line remover scans your text line by line, identifies repeated lines, and outputs only the unique lines — keeping either the first or last occurrence of each duplicate based on your setting.
Keep First retains the earliest occurrence of each duplicate line and discards later copies. Keep Last retains the most recent occurrence and removes the earlier ones.
By default, comparison is case sensitive, meaning "Apple" and "apple" are treated as different lines. You can toggle case-sensitive mode off to treat them as duplicates.
When enabled, lines that differ only by leading or trailing spaces are treated as duplicates and one copy is removed, giving you cleaner deduplicated output.
The reduction percentage shows what fraction of the original lines were duplicates. For example, 50% means half the lines were removed as duplicates, leaving only unique content.
Yes. Your text is processed securely on our server. No data is stored, logged, or shared — the deduplicated result is returned instantly and your text is discarded immediately after processing.