Remove Duplicate Lines

Clean up lists by removing duplicate lines, sorting the result and trimming whitespace.

Input (one item per line)

Trim whitespace

Case sensitive

Sort result

Result

How to Use This Tool

Paste a list with one item per line, choose your options, and click Remove duplicates.

Turn on trim to ignore accidental leading/trailing spaces.
Case-sensitive matching keeps "Apple" and "apple" as distinct items.

Frequently Asked Questions

What counts as a duplicate?

Two lines that are identical after applying your options. With case-sensitivity off, "Cat" and "cat" are treated as the same.

Will sorting change my order?

Only if you enable Sort. By default the first occurrence of each item keeps its original position.

Can I handle very large lists?

Yes, within your browser's memory limits — most lists of tens of thousands of lines work fine.

Is anything uploaded?

No. All processing happens locally in your browser.

Practical Example

Paste a list with one item per line — apple, banana, apple, cherry, banana. With Trim whitespace on, the result keeps first occurrences only: apple, banana, cherry.

The summary reports 3 unique lines (removed 2 duplicates).
Enabling Sort outputs apple, banana, cherry in alphabetical order instead of original order.
With Case sensitive on, Apple and apple count as two distinct lines.

What Your Results Mean

Unique lines — the number of lines kept in the output after duplicates are removed.
Removed duplicates — how many lines were skipped because an identical line was already seen.
Case sensitivity — when off, lines that differ only by capitalization are treated as the same line.