Duplicate Line Remover
Paste a list, and repeated lines disappear — with control over case, whitespace and ordering.
How to use
- Paste your text or list into the input box.
- Choose options: ignore upper/lower case, trim spaces before comparing, keep original order or sort.
- The cleaned text and the number of removed lines appear instantly — copy the result with one click.
Examples
Clean an email list
Paste 500 addresses collected from several sources; with case-insensitive matching on, John@x.com and john@x.com collapse into one line.
Deduplicate keywords
Merging keyword lists often leaves repeats with stray spaces. Enable trimming so “ shoes” and “shoes” count as the same line.
FAQ
Which duplicate is kept?
The first occurrence survives; later repeats are removed. With “keep original order” off, the surviving lines are sorted alphabetically instead.
What does the case-sensitivity option change?
When case-insensitive, “Apple” and “apple” are treated as the same line and only the first spelling is kept. When case-sensitive, they stay separate.
How are lines with extra spaces handled?
With “trim whitespace” on, leading and trailing spaces are removed before comparing (and in the output), so “ item ” equals “item”. Turn it off for strict byte-for-byte comparison.
Are blank lines removed too?
Blank lines are treated like any other line: the first blank stays, repeated blanks are removed. This collapses runs of empty lines to one.
Is my text uploaded?
No — deduplication runs entirely in your browser and the text never leaves your device.