Does it preserve line order?

Yes. The first occurrence of each line is kept; subsequent duplicates are removed. The relative order of unique lines is preserved.

Is case-sensitive mode the default?

Yes. 'Foo' and 'foo' are treated as different lines by default. Toggle the switch to treat them as duplicates.

Yes. Everything happens in your browser. Your data is never sent to a server.

Remove duplicate lines from any text instantly in your browser. Supports case-sensitive and case-insensitive modes.

1
Paste your text
Enter the text with duplicate lines in the input field.
2
Choose case sensitivity
Toggle case-sensitive mode to treat 'Foo' and 'foo' as duplicates or not.
3
Copy the cleaned output
The deduplicated text is shown instantly. Copy it with one click.

Does it preserve line order?: Yes. The first occurrence of each line is kept; subsequent duplicates are removed. The relative order of unique lines is preserved.
Is case-sensitive mode the default?: Yes. 'Foo' and 'foo' are treated as different lines by default. Toggle the switch to treat them as duplicates.
Is my data safe?: Yes. Everything happens in your browser. Your data is never sent to a server.

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Count words, characters, sentences, and estimate reading time instantly in your browser. No sign-up required.