Remove Duplicate Lines
Remove Duplicate Lines strips repeated lines from any list, keeping the first time each line appears and preserving the original order. Optional toggles let you ignore case, trim surrounding whitespace before comparing, and drop empty lines.
It all happens in your browser, so even large lists of emails, URLs or keywords stay private.
How to use Remove Duplicate Lines
- 1
Paste your list
Drop in any text where each item is on its own line.
- 2
Choose your matching options
Optionally ignore case, trim whitespace, or remove empty lines before deduplicating.
- 3
Copy the unique lines
The cleaned list and a count of removed duplicates appear instantly — copy the result with one click.
First occurrence is kept
When a line repeats, the first appearance is preserved and later copies are removed. Because the original ordering is maintained, this is safe for ranked lists, configuration files and ordered data — you won't get a reshuffled result.
If you'd rather have the list alphabetized as well, run the output through the Sort Lines tool.
Case and whitespace matching
By default, comparison is exact. Turn on "ignore case" so that "Apple" and "apple" are treated as the same line. Turn on "trim whitespace" so that lines differing only by leading or trailing spaces are also collapsed together.
These options matter when deduplicating data pasted from spreadsheets or scraped from the web, where invisible inconsistencies are common.
Frequently asked questions
- Does it keep the original order?
- Yes. The first occurrence of each line stays in place and the order of the remaining lines is unchanged.
- Can it ignore case when comparing?
- Yes. Enable "ignore case" to treat lines that differ only in capitalization as duplicates.
- Is my data uploaded?
- No. Deduplication runs entirely in your browser.
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