Remove Duplicate Lines
Remove repeated lines from pasted text while keeping each first occurrence. Toggle case-sensitive and trim matching as needed.
On this page
A remove duplicate lines tool deletes repeated lines from pasted text and keeps the first occurrence of each, in the order it first appeared. Paste a list, tick the options you want, press Remove duplicates, and the cleaned text appears directly below.
What you can paste
It handles anything line-based: email lists, keyword dumps, product SKUs, DNS records, or repeated config keys. Paste a block where “bootstrap” shows up three times and the output keeps it once, at the position where it appeared first.
Comparing before and after
Input with one, two, one, three, two across five lines produces three lines: one, two, three. A status line under the result reports how many lines were removed, so you know the cleanup worked even before you copy.
The three options
- Case-sensitive matching treats “Apple” and “apple” as different lines. Leave it off and they collapse into one.
- Trim spaces before comparing strips leading and trailing whitespace from each line first, so “one” and ” one ” match and only the first spelling is kept.
- Ignore empty lines leaves blank lines untouched instead of treating every blank as the same duplicate.
Using it
- Paste the text into the Your text box.
- Switch on the matching options you need.
- Press Remove duplicates and read the result below.
- Copy the cleaned text with the copy icon.
Everything is processed in the browser, so there is no upload and no size worry for lists of thousands of lines. If no duplicates exist, the tool says so and leaves the text exactly as pasted.