Duplicate Line Remover - Remove Repeated Lines Online
Quick Tips
- • Each line is treated as a separate item
- • Disable "Case sensitive" to merge "Hello" and "HELLO"
- • Great for cleaning up email lists and data exports
- • Enable "Trim whitespace" to catch hidden duplicates
Remove duplicate lines from text instantly. Keep unique entries only.
Original
Unique
Removed
Reduction
Examples
apple banana apple orange banana grape
apple banana orange grape
john@email.com jane@email.com JOHN@EMAIL.COM john@email.com
john@email.com jane@email.com
Item 1 Item 1 Item 2 Item 2
Item 1 Item 2
Error: Connection failed Warning: Timeout Error: Connection failed Error: Connection failed Info: Retry successful
Error: Connection failed Warning: Timeout Info: Retry successful
Frequently Asked Questions
The tool compares each line exactly as entered. With case sensitivity enabled, "Apple" and "apple" are treated as different lines. With it disabled, they are considered duplicates and only one is kept.
By default, the first occurrence is preserved and subsequent duplicates are removed. You can toggle "Keep first occurrence" off to instead keep the last occurrence of each duplicate.
Yes, by default "hello" and " hello " are considered different lines. Enable "Trim whitespace from lines" to ignore leading and trailing spaces when comparing lines.
No, all processing happens entirely in your browser. Your text never leaves your computer, making this tool safe for sensitive data like email lists or confidential information.
Yes, enable the "Remove empty lines" option to eliminate blank lines along with duplicates in a single operation.
The tool can handle large amounts of text, limited only by your browser's memory. For most use cases including lists with thousands of lines, processing is instant.
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