Remove Duplicate Lines
Clean duplicate lines from lists and text instantly.
About this tool
Remove Duplicate Lines cleans repeated entries from any list while preserving the original order of first appearance. Paste keyword lists, email addresses, URLs or CSV columns and get a deduplicated result instantly, with a count of how many lines were removed.
Two options give you control over matching: case sensitivity (treat “Apple” and “apple” as the same or different) and whitespace trimming (ignore leading and trailing spaces when comparing).
Frequently asked questions
No. The first occurrence of each line stays where it was; only later duplicates are removed.
Yes — it uses a hash set, so even lists with hundreds of thousands of lines process almost instantly.
The first empty line is kept and subsequent empty lines are treated as duplicates of it.