Remove Duplicate Lines
Remove duplicate lines while keeping one copy of each line. Paste your list, dedupe it fast, then copy the cleaned output. Copy it.
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RESULT:
What this does
Got a list with the same entries showing up more than once? This clears out the repeats. It goes through your text line by line and keeps a single copy of each one, dropping every duplicate that follows. Paste your list, click, and get back a clean version with no line repeated.
How to use it
- Paste your list or text into the box on the left.
- Press Remove, and the deduplicated version appears on the right.
- Press Copy to take it, or Clear to wipe everything.
It all runs in your browser, so even a long list stays private to you.
How the deduping works
The tool treats every line as one item and keeps the first time each item appears, throwing away any later copies. Importantly, it holds on to your original order. The first appearance of a line stays exactly where it was, so the list is not shuffled or sorted, it simply has the repeats removed from further down. Repeated blank lines are folded together too, so a list scattered with empty lines comes back with at most a single one.
It matches lines exactly
This is the detail to keep in mind. Two lines count as the same only when they match character for character. That makes the matching strict in two ways worth knowing. It is case sensitive, so Apple and apple are seen as different lines and both are kept. And it notices spacing, so apple and apple with a trailing space are also treated as different. If your list has near-duplicates that differ only by capitals or a stray space, give it a tidy first. Bringing everything to one case with the lowercase tool, for instance, lets a looser round of deduping catch them.
When this comes in handy
Any time you are working with a list, this earns its keep. Think of a column of email addresses with repeats, a keyword list that has grown messy, a set of URLs gathered from a few places, or log lines where the same entry keeps recurring. Trimming the duplicates by eye is slow and you are bound to miss some. This does it in one pass and keeps your order intact, so you can carry straight on to whatever the list is for.
Questions people ask
Does it sort or reorder my lines?
No. It keeps your original order and only removes the repeats, leaving the first appearance of each line in its place.
Are Apple and apple treated as the same line?
No, the matching is case sensitive, so those count as two different lines and both are kept. Lowercase your text first if you want them merged.
Why did two lines that look identical both stay?
One of them probably has an extra space somewhere, often a trailing one. Since lines must match exactly, a hidden difference like that keeps them apart.
What happens to repeated blank lines?
They are deduplicated like any other line, so several blank lines collapse to a single one in the result.
Sarayu is an Assistant Lecturer at Herald College, currently studying Masters of Engineering at KU. She is a Software engineer and educator who enjoys writing, and publishes essays and articles. She helps to review word/text utilities for clarity and usability.