Remove Duplicate Lines
Remove duplicate lines from a list or block of text, instantly and locally.
How to use
- 1Paste a list of lines into the box.
- 2Adjust case-sensitivity and whitespace options if needed.
- 3Copy or download the deduplicated result.
Features
- Preserves original line order
- Optional case-insensitive matching
- Optional empty line removal
Supported formats
Privacy
Your text is processed locally in your browser and is never sent to our server.
About this tool
Remove Duplicate Lines scans a block of text line by line and removes any line that has already appeared, keeping the first occurrence. It is useful for cleaning up lists, email addresses, log files or CSV-like data before further processing.
Frequently asked questions
Does this keep the original line order?
Yes, the first occurrence of each line is kept in its original position; later duplicates are removed.
Can I ignore case when comparing lines?
Yes, turn off 'Case-sensitive' to treat lines that differ only in capitalization as duplicates.
Is my text sent to a server?
No, duplicate removal happens entirely in your browser.
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