Remove Duplicate Lines

Each line is compared as an exact string. Lines that appear more than once are reduced to a single occurrence. Leading/trailing whitespace can optionally be trimmed before comparison.

By default, yes — 'Hello' and 'hello' are treated as different lines. Most tools offer a case-insensitive option that normalizes text before comparison.

Yes, the first occurrence of each line is kept in its original position. Subsequent duplicates are removed.

For CSV deduplication, first identify which column(s) define uniqueness, then use this tool on extracted values, or use the Merge CSV tool which offers built-in deduplication.