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Remove Duplicate Lines
Remove duplicate lines from any text. Choose case-sensitive or insensitive matching, trim whitespace, and see how many duplicates were removed.
Input (1 lines)
Output (0 lines)
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Frequently Asked Questions
Quick answers to common questions
How does duplicate line removal work?+
The tool reads your text line by line, keeping only the first occurrence of each unique line. Subsequent duplicates are removed.
What is case-sensitive matching?+
With case-sensitive matching, "Apple" and "apple" are treated as different lines. Without it, they are considered duplicates.
Will blank lines be removed?+
Empty lines are treated as duplicates too — only the first empty line is kept unless you trim whitespace first.
Can I use this for email lists?+
Yes. Paste one email per line and remove duplicates to clean your mailing lists before importing to any email tool.