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.
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.
See It in Action
apple
banana
apple
cherry
bananaapple
banana
cherry hello
hello
hello
worldhello
worldAbout 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.
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).
When enabled, the output keeps lines in their original order and only removes later duplicates. When disabled, the unique lines are sorted alphabetically.
When enabled, leading and trailing spaces are stripped from each line before comparing. This means ' apple ' and 'apple' are treated as the same line.
Yes — enable the 'Case-insensitive' toggle to treat 'Apple' and 'apple' as the same line. This is useful for normalizing inconsistent data.
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.
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