Remove Duplicate Lines
Remove duplicate lines from text instantly. Case-insensitive matching, whitespace trimming, first/last occurrence options. Free and private.
About this tool
This tool removes duplicate lines from your text, keeping only unique entries. It preserves the original order and supports case-insensitive matching and whitespace trimming.
Useful for cleaning up lists, email addresses, data exports, or any text where duplicates need to be removed. All processing happens in your browser.
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Frequently Asked Questions
How does duplicate detection work?
Each line is compared to all other lines. When a duplicate is found, only the first occurrence is kept by default. You can toggle case-insensitive matching and whitespace trimming.
Does it preserve line order?
Yes. The original order of unique lines is preserved. Only the extra copies are removed.
Can it handle large texts?
Yes. The tool runs in your browser and handles thousands of lines efficiently.