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Remove Duplicate Lines

Dedupe lists, logs, or CSV rows while preserving first-seen order.

Key Features

  • Removes exact duplicate lines (case-sensitive)
  • Preserves first-seen order
  • Handles lists of any size — thousands of lines in milliseconds
  • No trimming: blank lines are kept unless duplicated

Benefits

  • Clean up email lists, CSV exports, or log dumps
  • Dedupe URL lists before batch processing
  • Speed up import-to-database workflows
  • Sanity-check that your data is unique

How to use this tool

1

Paste your list, one item per line

2

Click Process

3

Copy the deduplicated list

Frequently Asked Questions

Is it case-sensitive?

Yes — 'Apple' and 'apple' are treated as different lines. Use the Smart Case Converter first if you need case-insensitive dedup.