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Duplicate Line Remover & List Deduplicator

Deduplicate lists, emails, keywords, and data rows. Supports case-sensitive or case-insensitive matching, empty line removal, whitespace trimming before comparison, and optional sorting.

⚡ Quick Answer

Duplicate Line Remover compares each row in a text list and eliminates identical occurrences, leaving only unique entries.

💡 How It Works

Splits text into an array of lines, normalizes whitespace and casing per user settings, and uses a Set data structure to retain the first occurrence of each unique line.

📖 How to Use Duplicate Line Remover

  1. Paste your list of items (one per line).
  2. Toggle case sensitivity and sorting options.
  3. Click Remove Duplicates to get your clean list of unique lines.

✨ Key Features

  • Instant set-based deduplication O(n) performance
  • Original line ordering preservation or alphabetical sort
  • Empty line filter

❓ Frequently Asked Questions

Can this tool process thousands of lines safely?

Yes. Because processing runs in a native JavaScript Set in your browser, it can deduplicate tens of thousands of rows in milliseconds.