Free Remove Duplicate Lines
Mailing lists, keyword lists and data exports always contain repeats. Paste your lines here and this free tool deletes every duplicate while preserving the original order — telling you exactly how many lines it removed.
How to Use the Remove Duplicate Lines
- Paste your lines (one per line).
- Tick case-insensitive matching if wanted.
- Click “Remove duplicates”.
- Copy or download the deduplicated list.
Features
Order-preserving deduplication: the first occurrence of each line stays exactly where it was. Optional case-insensitive mode treats “Apple” and “apple” as duplicates, and blank lines can be exempted from deduping. Reports before/after counts and the number removed.
Benefits & Use Cases
Marketers clean email and keyword lists before campaigns. Developers dedupe config entries and test data. Researchers tidy survey responses. Anyone merging two lists gets a clean union without spreadsheet formulas.
Tips
Enable case-insensitive matching when deduping human-typed lists — capitalization inconsistencies are the most common hidden duplicates. If blank lines matter as separators, keep the “keep blank lines” option on. For duplicate words (not lines), use the Duplicate Word Finder.
Frequently Asked Questions
Is it free?
Yes, completely free with no limits.
Does it keep the original order?
Yes — the first occurrence of each line stays in place; only later repeats are removed.
What does case-insensitive do?
It treats lines differing only in capitalization as duplicates, e.g. “Apple” and “APPLE”.
Can it remove duplicate words?
This tool works on whole lines. For repeated words inside text, try Duplicate Word Finder.
Is my list uploaded?
No, everything happens in your browser.
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