What does the 'Preserve Order' option do?

When enabled, the output keeps lines in their original order and only removes later duplicates. When disabled, the unique lines are sorted alphabetically.

What does 'Trim Whitespace' do?

When enabled, leading and trailing spaces are stripped from each line before comparing. This means ' apple ' and 'apple' are treated as the same line.

Can I remove duplicates case-insensitively?

Yes — enable the 'Case-insensitive' toggle to treat 'Apple' and 'apple' as the same line. This is useful for normalizing inconsistent data.

What are common use cases for this tool?

Common uses include deduplicating email lists, cleaning up CSV data, removing repeated lines from code or configs, and filtering unique keywords from large keyword lists.

≡Remove Duplicates·Free online tool

Remove Duplicate Lines

Paste a list with duplicate entries and remove them in one click. Options to preserve original order, trim whitespace, and handle case-insensitive matching.

Guide

How to Use This Tool

1
Paste your text or list into the input area.
2
Choose your options: Preserve Order, Trim Whitespace, and Case-insensitive.
3
The tool instantly shows the unique lines and how many duplicates were removed.
4
Click 'Copy' to copy the clean output to your clipboard.

Examples

See It in Action

Basic Deduplication

Input

apple
banana
apple
cherry
banana

Output

apple
banana
cherry

With Trim Whitespace

Input

  hello  
hello
  hello  
world

Output

hello
world

About

About the Remove Duplicates Tool

The Remove Duplicate Lines is a free, browser-based utility. All processing happens entirely in your browser — your text is never sent to any server and is never stored.

Designed for speed and simplicity, this tool works instantly with zero setup. Whether you're a developer, writer, student, or content creator, remove duplicates has never been this easy.

Free foreverNo sign-upWorks offlinePrivacy-first

FAQ

Frequently Asked Questions

This tool scans each line in your text and removes any lines that appear more than once, keeping only the first occurrence (or a sorted unique list if you disable preserve order).