If a document contains the same entries multiple times, manually checking every line can take a lot of time. A dedicated tool can remove duplicate lines quickly by comparing the entries and keeping only unique ones. This is useful for cleaning copied lists, keywords, URLs, names, or other text-based data. Before processing, make sure the lines are formatted consistently because extra spaces or different capitalization may affect how duplicates are recognized. Always review the final output to confirm that important information has not been removed accidentally.