About this tool
Remove duplicate lines from any block of text.
Paste a list with repeated lines and get a clean, deduplicated result instantly. The Duplicate Line Remover identifies and removes repeated lines, keeping the first occurrence. Options include case-insensitive comparison and whitespace trimming before comparing, so " Apple " and "apple" can be treated as duplicates.
Example
Input (5 lines, 2 duplicates): apple / banana / apple / cherry / banana → Result (3 unique): apple / banana / cherry
How to use
- Paste your list into the input.
- Choose case-sensitive or insensitive mode.
- Choose whether to trim leading/trailing whitespace.
- Click Remove Duplicates.
Features
- Case-sensitive and insensitive modes
- Whitespace trimming option
- Preserves original line order
- Shows count of removed duplicates
- Handles thousands of lines
Frequently Asked Questions
Which occurrence is kept?+
The first occurrence of each line is kept. All subsequent duplicates are removed.
Does it compare case-sensitively by default?+
Yes — "Apple" and "apple" are treated as different lines by default. Enable case-insensitive mode to treat them as the same.
Can it handle blank lines?+
Yes. You can choose to strip blank lines entirely or keep them as part of the deduplication.
Is there a line limit?+
No practical limit. The tool handles tens of thousands of lines without performance issues.
Can it remove blank lines at the same time?+
Yes. Enable the "strip blank lines" option to remove empty lines while deduplicating.
Does it work on large lists?+
Yes. The tool handles tens of thousands of lines in the browser without performance issues.