Duplicate Line Remover
Clear repeated lines from your text instantly and privately in the browser. You set the rules: case sensitivity, whitespace trimming, keeping the first or last occurrence, ignoring blank lines, and whether to sort the result or only collapse consecutive duplicates. Your text never leaves your device.
- 100% free
- Private & safe
- Runs in your browser
Why use Remove Duplicate Lines?
Remove Duplicate Lines is a fast, distraction-free way to work with text: paste your content, transform it, and copy the result instantly.
- Runs instantly in your browser — nothing to install, nothing uploaded.
- Completely free, with no account, no watermarks and no usage limits.
- Handles Case-sensitive keeps 'Apple' and 'apple' as different lines.; Case-insensitive treats 'Apple' and 'apple' as the same..
- Paste your text into the input box.
- Works on any device — desktop, tablet and phone — and is fully keyboard accessible.
How to use Remove Duplicate Lines
- Paste your text into the input box.
- Adjust options: case sensitivity, trim whitespace, keep first or last, ignore blanks, sort, or consecutive-only.
- See the deduplicated result update instantly, with counts of original, unique and removed lines.
- Copy the result, download it as a .txt file, or move it back into the input.
Examples
- Cleaning a list of email addresses that contains duplicates.
- Collapsing repeated log lines while keeping the original order.
Supported formats & limits
- Case-sensitive keeps 'Apple' and 'apple' as different lines.
- Case-insensitive treats 'Apple' and 'apple' as the same.
Limitations
- Line comparison uses your chosen options; results change with different settings.
- Sorting uses locale comparison and may order mixed-case text differently than a strict byte sort.
Frequently asked questions
Does it keep the original order?
By default yes — the first occurrence of each line stays in place. You can switch to keep the last occurrence, or sort the result.
Can I ignore case?
Yes. Turn off 'Case sensitive' to treat lines that differ only by capitalization as duplicates.
Is my text uploaded?
No. Everything happens in your browser and your text is never sent anywhere.
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