Remove Duplicate Lines
Delete repeated lines from a list while keeping the original order.
Paste a list to remove duplicate lines instantly. The first occurrence of each line is kept and the original order is preserved. Optionally ignore case and surrounding spaces.
Private by design. Your text is processed entirely in your browser — it is never uploaded, logged, or stored on a server.
When to use it
Cleaning up email lists, keyword lists, CSV columns, log lines, or any list that has accumulated duplicates. Because everything runs locally, you can safely de-duplicate sensitive lists without uploading them anywhere.
Use "ignore case" to treat "Apple" and "apple" as the same line, and "trim whitespace" so lines that differ only by trailing spaces are recognized as duplicates.
Examples
| Example | Input | Result |
|---|---|---|
| Basic | apple
banana
apple | apple banana |
| Ignore case | Apple
apple | Apple |
Frequently asked questions
Which duplicate is kept?
The first occurrence of each line is kept, and the rest are removed, preserving the original order.
Can I treat different capitalizations as duplicates?
Yes. Enable "ignore case" so "Apple" and "apple" are treated as the same line.