Remove Duplicate Lines

Secure & Client-Side

Free List Cleaner & Deduplicator for Email Lists, SKUs, and Datasets

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Paste your list with duplicates in the left panel. Our tool will instantly identify and remove duplicate lines, giving you a clean, unique list in the right panel.

Perfect for cleaning product SKU lists, email lists, inventory data, or any text dataset. No data leaves your browser - processing happens entirely on your device.

Input List

Lines: 0

Unique Lines Output

Unique: 0
Original Lines
0
Unique Lines
0
Removed Duplicates
0
Reduction
0%

Deduplication Settings

Treat 'Apple' and 'apple' as different lines

Ignore leading/trailing spaces when comparing

Automatically delete blank lines from results

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Frequently Asked Questions

How does this duplicate remover compare to Excel?

Our tool is specifically designed for text list deduplication and offers several advantages over Excel:

  • No software installation required - works directly in your browser
  • Faster processing for large lists (up to 100,000+ lines)
  • More control with case sensitivity and whitespace options
  • Secure client-side processing - your data never leaves your device
  • Specialized for text/list operations rather than spreadsheet functions
What types of lists can I clean with this tool?

This duplicate line remover is versatile and works with any text-based list:

  • E-commerce: Product SKUs, inventory lists, supplier catalogs
  • Marketing: Email lists, subscriber databases, lead lists
  • Data processing: CSV data, log files, code snippets
  • Academic: Reference lists, bibliography entries
  • General: Any text list where you need unique entries

The tool preserves the original order of unique items (first occurrence is kept).

Is there a limit to how many lines I can process?

Our tool can handle very large lists efficiently:

  • Performance: Can process 100,000+ lines in under 5 seconds on modern browsers
  • Browser memory: The main limitation is your browser's available memory
  • Recommended: For lists over 500,000 lines, consider processing in batches

Since all processing happens client-side, your internet speed doesn't affect performance. For massive datasets (millions of lines), dedicated desktop software might be more appropriate.

How does the case sensitivity option work?

The case sensitivity setting changes how the tool compares lines:

Case Sensitive OFF (Default)

"Email@Example.com", "email@example.com", and "EMAIL@EXAMPLE.COM" are treated as duplicates.

Use for: Email lists, product names where case doesn't matter

Case Sensitive ON

"Apple", "apple", and "APPLE" are treated as different, unique lines.

Use for: Code snippets, passwords, case-sensitive identifiers