♊ Remove Duplicate Lines

Remove duplicate lines from text. See what was removed. Free, private, processed in your browser.

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Result (unique lines)

About Remove Duplicates

Remove duplicate lines from text and CSV data. Case-sensitive or case-insensitive mode. Trim whitespace option. See duplicate counts at a glance. All processing in your browser — your data never leaves your device.

Smart Dedup

Remove exact or case-insensitive duplicates. Shows how many duplicates were found and removed.

Whitespace Handling

Optional whitespace trimming before comparison. Catches duplicates with inconsistent spacing.

Bulk Processing

Handles thousands of lines instantly. Perfect for cleaning email lists, URLs, IDs, and CSV data.

Local Processing

All deduplication runs in your browser. No uploads — safe for sensitive customer data and internal lists.