Remove Duplicate Lines - Deduplicate Text Online

Remove duplicate lines from text instantly. Keep unique lines only. Case-sensitive options. Free, private, works offline.

Drop a text file here

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Input Text

0 lines

Unique Lines

0 lines (0 removed)

Ignore case

Trim whitespace

Remove empty lines

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Frequently Asked Questions

Lines are compared exactly. Enable 'Ignore case' to treat 'Hello' and 'hello' as duplicates. Each line is checked against previously seen lines in the order they appear.

Yes. The first occurrence of each line is kept in its original position. If 'Apple' appears on line 5 and again on line 20, only line 5 is kept.

Yes. Enable 'Trim whitespace' to ignore leading/trailing spaces when comparing. Lines with different spacing but same content are treated as duplicates.

Yes. All processing happens in your browser using JavaScript. No data is sent to any server. Perfect for sensitive data like email lists or customer information.

Enable 'Remove empty lines' to exclude blank lines from the output. This option removes all lines that contain only whitespace or are completely empty.

Yes. This tool works well for removing duplicate entries from CSV files, log files, or any line-based data. Each line is treated as a complete record.

Case-sensitive treats 'Apple' and 'apple' as different lines. Case-insensitive (Ignore case enabled) treats them as duplicates and keeps only the first occurrence.

No hard limit. The tool efficiently handles thousands of lines. Files with 100,000+ lines may take a few seconds depending on your device's processing power.

Yes. The tool correctly handles Unicode characters, emojis, special symbols, and international text. All character comparisons are Unicode-aware.

Yes. The tool displays the count of removed duplicates below the output. This shows you exactly how many lines were filtered out from the original input.

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