Free Duplicate Line Remover

Useful for cleaning email lists, keyword lists, or any line-separated data before importing into another tool or spreadsheet. The case-insensitive option treats "Apple" and "apple" as the same line, keeping whichever version appeared first.

Worked Example

Example: Input apple\nbanana\napple\ncherry becomes apple\nbanana\ncherry — the second "apple" is removed.

Method

Splits input by line, tracks seen lines in a Set, and keeps only the first occurrence of each unique line.

Worked Example

Example: Input apple\nbanana\napple\ncherry becomes apple\nbanana\ncherry — the second "apple" is removed.

Method

Splits input by line, tracks seen lines in a Set, and keeps only the first occurrence of each unique line.