UtilityBaseText Tools
Remove Duplicate Lines
Deduplicate any list — keep the first occurrence of each line.
Updated January 25, 2026
How to use the remove duplicate lines
- 1Paste your list, one item per line.
- 2Choose options: ignore case, trim whitespace, remove empty lines.
- 3Click Remove Duplicates and copy the cleaned list.
Common uses
- Dedupe email or keyword lists before importing them.
- Clean exported data with repeated rows.
- Merge multiple lists and remove overlap.
Frequently asked questions
Does the tool keep my list's order?
Yes. It keeps the first occurrence of each line in its original position and removes later repeats, so the list order is preserved.
Are 'Apple' and 'apple' treated as duplicates?
Only if you enable the ignore-case option. With it off, comparisons are exact and the two lines are kept as distinct.
What does the trim option do?
It removes spaces and tabs from the start and end of each line before comparing, so 'apple ' and 'apple' count as the same line. The output keeps the first occurrence's original text.
How large a list can I process?
Lists with hundreds of thousands of lines process in well under a second since everything runs locally in your browser.
About this tool
Remove Duplicate Lines cleans lists by deleting repeated lines while preserving the original order of first occurrences. Options let you ignore letter case when comparing (so 'Apple' and 'apple' count as duplicates), trim surrounding whitespace before comparing, and drop empty lines. It's the quickest way to dedupe email lists, keyword sets, log excerpts, and exported data before further processing — and it shows exactly how many duplicates were removed. Processing is instant and local.
Like everything on UtilityBase, the remove duplicate lines runs entirely in your browser — nothing you enter is uploaded or stored on a server. It's free to use with no account required. Browse more text tools here.
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