Remove Duplicate Lines
Paste a list to remove repeated lines, keeping the first of each, with a count of how many were removed.
How to use it
- Paste your lines One item per line.
- Set the options Choose case sensitivity, trimming and whether to drop blanks.
- Copy the result Duplicates are gone, original order kept.
Examples
| a, b, a, c | a, b, c |
|---|---|
| Removed count | 1 |
About this tool
This tool removes repeated lines from a list while keeping the first of each and preserving the original order — useful for cleaning up email lists, keywords, logs and any text with accidental duplicates.
Options let you ignore letter case, trim surrounding spaces before comparing, and drop blank lines. It also tells you how many lines were removed. Everything runs in your browser.
Frequently asked questions
Which duplicate is kept?
The first occurrence of each line is kept; later repeats are removed, so the original order is preserved.
What does "trim whitespace" do?
It ignores leading and trailing spaces when comparing, so " apple" and "apple" count as the same line.
Related tools
Sort Lines Alphabetically Paste a list and sort the lines A→Z, Z→A or numerically, with optional case sensitivity. Word Counter Paste your text to see live word, character, sentence and paragraph counts — plus an estimated reading time. Case Converter Paste text and instantly see it in every common letter case, each with a one-click copy button. Slug Generator Convert a title into a lowercase, hyphenated URL slug, with a choice of separator. Word Frequency Counter Paste text to rank the most common words with their counts and share of the total. Text Diff Checker Compare two texts line by line and see added and removed lines highlighted, with a change count.
Updated June 12, 2026