Duplicate line remover
Paste a list or text block and receive one copy of each exact line.
Remove repeated lines while keeping their first occurrence.
About this tool
The duplicate line remover keeps the first occurrence of every exact line and removes later matches. Original order is preserved, and blank lines are treated like any other line. Use it to clean copied identifiers, remove repeated email candidates, tidy a word list, or prepare rows before an import. Comparison is case-sensitive, so lines with different capitalization or spacing remain separate and can be reviewed instead of silently combined.