About this tool
Paste a list and get back only the unique lines, in their original order. Options let you ignore letter case and ignore leading or trailing whitespace when deciding what counts as a duplicate, plus an optional alphabetical sort of the output.
Duplicate lines creep into exported email lists, log files, keyword research sheets and SKU lists. Removing them by hand is error-prone past a few dozen lines; this tool handles tens of thousands of lines instantly and reports how many duplicates were removed.
How to use it
- Paste your list, one item per line.
- Choose matching options (ignore case, trim whitespace).
- Click Remove duplicates and copy the cleaned list.
Frequently asked questions
Is the original line order kept?
Yes — the first occurrence of each line is kept in place. Enable the sort option if you want alphabetical output instead.
How large a list can it handle?
Comfortably hundreds of thousands of lines; the work is a single pass through the text on your own machine.
Does “ignore case” change the output text?
No. It only affects matching — the kept line preserves its original capitalization.