Remove Duplicate Lines — Free Online Text Deduplicator

Paste your text and get unique lines instantly. This tool removes duplicate lines while preserving readable content and order, so you can clean lists, CSV-ish blocks, or logs in seconds.

• Remove exact duplicate lines (optionally case sensitive)
• Choose to keep the first or the last occurrence
• Preserve original order or output sorted unique lines
• One-click copy and clear
• Bulk-friendly, works with large text

Input
apple
banana
apple
orange
Banana

Output (case insensitive)
apple
banana
orange

Output (case sensitive)
apple
banana
orange
Banana

What duplicates are removed?

Exact line matches. If you need per-word de-duplication, try removing duplicate words first.

Will my line order change?

No, unless you enable sorting. By default, the first occurrence is kept and order is preserved.

How big can the input be?

Large blocks are fine; processing happens in the browser for speed and privacy.