Remove Duplicate Lines (Deduplicate)

Find and remove repeated lines from a text list, with options to ignore case and trim whitespace.

How It Works & Processing Standards

Find and remove repeated lines from a text list, with options to ignore case and trim whitespace.

Your input data is never sent to any server and is securely processed on your device.

Current Limits

  • Maximum input length: 2,000,000 characters

Remove Duplicate Lines (Deduplicate) is a 100% free, browser-based online utility. All calculations and file conversions run locally inside your browser (Local-First) without sending data to remote servers, keeping your documents and inputs strictly private.

How to Use Remove Duplicate Lines (Deduplicate)

  1. 1
    Paste ListEnter your list with potential duplicates.
  2. 2
    Configure OptionsOptionally toggle case-insensitivity and trimming.
  3. 3
    Copy Unique ListCopy deduplicated lines.

Common Use Cases

  • Cleaning email mailing lists and scraping results by removing duplicate entries
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