Is the comparison case-sensitive?

Yes. 'Apple' and 'apple' are treated as different lines. Convert to the same case first if you need case-insensitive deduplication.

Does this preserve line order?

Yes. The first occurrence of each line is kept in its original position. Only subsequent duplicates are removed.

All blank lines are considered identical. If you have multiple blank lines, only the first one is kept.

There is no strict limit. The tool processes everything in your browser, but very large texts (100,000+ lines) may take a moment.

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Text Tools

Remove duplicate lines from text blocks instantly. Paste your text and get a clean list with only unique lines — perfect for data cleanup.

Input Text

Paste text with duplicate lines, then click Remove Duplicates.