Duplicate Line Remover
BetaThis tool is in beta. Some features may change or have limited functionality.Remove duplicate lines from text instantly. Options for case sensitivity, whitespace trimming, sorting, and preserving first or last occurrence.
Options
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Why Use Our Duplicate Line Remover?
Cleaning up duplicate data is a common task when working with log files, email lists, CSV data, or any line-based text. Our tool processes text instantly as you type, with options for case-insensitive matching, whitespace trimming, and output sorting. You can also view only the duplicates to understand what was removed. Everything runs in your browser — no data is uploaded to any server.
Frequently Asked Questions
How does case-insensitive matching work?
When case sensitivity is off, 'Hello' and 'hello' are treated as duplicates. The first (or last) occurrence is kept with its original casing.
What does Trim Whitespace do?
It removes leading and trailing spaces from each line before comparing. Lines like ' hello ' and 'hello' would be treated as duplicates.
Can I see which lines were duplicates?
Yes, toggle 'Show Duplicates Only' to see all the lines that were removed as duplicates.
Is my text uploaded to a server?
No, all processing happens entirely in your browser. Nothing is sent to any server, making it safe for sensitive data.
Is this tool free?
Yes, completely free with no signup required, no ads, and no usage limits.