Free Duplicate Line Remover Online
Strip duplicate lines from any list. Case-sensitive option, trim option, original order preserved. Browser-only.
A duplicate line remover deduplicates a list by line, keeping the first occurrence of each unique line. Notepad AI's tool gives you case-sensitivity and whitespace-trim toggles for clean deduplication of lists, emails, URLs, or any line-based data.
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Duplicate Line Remover FAQ
How does the duplicate remover work?
It splits your text by line, keeps the first occurrence of each unique line, and removes subsequent duplicates. The original order of first-occurrences is preserved.
What's the 'case-sensitive' option?
When ON, 'Hello' and 'hello' are treated as different lines. When OFF, they're treated as the same. Turn off for email lists or names where capitalization varies but the content is the same.
What's the 'trim whitespace' option?
When ON, leading/trailing whitespace on each line is ignored for comparison. So 'apple' and ' apple ' are treated as duplicates. Recommended ON for most use cases — output preserves original whitespace.
Is the tool free?
Yes — completely free, no signup, no login.
Is my data private?
Yes. All deduplication happens in your browser. No data is uploaded or logged.
What about empty lines?
Multiple empty lines are treated as duplicates and removed — only the first empty line is kept. If you want to preserve paragraph spacing, remove duplicates from your content list before adding empty separators.
Can I sort the result?
This tool preserves original order. If you want sorted unique lines, run the result through the Text Sorter tool.