What order do the unique lines appear in?

First occurrence is kept; subsequent duplicates are dropped. The original ordering is preserved.

Does case sensitivity matter?

By default no — “Apple” and “apple” are treated as duplicates. Turn on case-sensitive mode to treat them as different.

When on, leading and trailing spaces are ignored during comparison (but the original line is kept in the output).

By default yes. Turn on “Keep blank lines” if you want to preserve them as part of the output.

No hard limit — processing is local and handles tens of thousands of lines comfortably.

Dedupe a list of lines — case-sensitive or trimmed options.

100% private — no uploads Text ToolsFree & unlimited Read tutorial

Watch a quick simulation of this tool in action — no file needed.

Follow these steps — everything happens instantly in your browser.

1
Step 1. Paste your lines into the input area.
2
Step 2. Toggle case-sensitive matching if you need to treat “Apple” and “apple” as different.
3
Step 3. Toggle trim whitespace to ignore leading/trailing spaces when comparing.
4
Step 4. Review the unique output, the removed count and the unique count, then copy.