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Duplicate Line Remover

Remove duplicate lines from email lists, spreadsheet columns, and text logs in your browser with sorting and cleanup options.

Free to useNo sign-up requiredWorks in your browserPrivacy focused

Duplicate Line Remover Workspace

How to use

  1. 1

    Step 1

    Paste your list of lines, emails, URLs, or text items into the Source Lines box.

  2. 2

    Step 2

    Choose your Filter Rules: Case-Sensitive matching, Trim Whitespace, Remove Empty Lines, and Sort Output order.

  3. 3

    Step 3

    Check the summary counts for Unique Lines and Duplicates Removed, then copy or download your cleaned list.

Key features

  • Instantly removes repeated lines from small or large lists up to 250,000+ lines
  • Option to ignore uppercase/lowercase differences so '[email protected]' and '[email protected]' count as duplicates
  • Automatically trims accidental spaces at the start or end of lines and removes blank rows
  • Keep your list in its original order or sort results alphabetically (A to Z or Z to A)

Supported formats

TXTCSV

File limits & notes

Supports plain-text lists up to 25 MB (over 250,000 lines). When Case-Sensitive is turned off, the tool keeps the first version of a line it sees and removes any later uppercase or lowercase duplicates.

Frequently asked questions

View all FAQs
Will removing duplicates change the order of my list?

Not unless you want it to. By default, Keep Original Order leaves your items in the exact order they first appeared. You can also choose Alphabetical (A to Z) or Reverse (Z to A) sorting.

What does Trim Whitespace do?

It removes extra spaces or tabs at the beginning and end of each line before comparing them, so 'apple' and 'apple ' are recognized as the same item.

Can I use this tool with sensitive email lists or log files?

Yes. Your list is cleaned directly inside your browser and is never uploaded or stored on any server.

Practical Example: Cleaning Up an Exported Mailing List

Sample Input
A list of 15,000 email addresses with duplicate entries, mixed capitalization, extra spaces, and empty rows.
Result
Cleaned to a unique, alphabetically sorted list in a fraction of a second without uploading contact data anywhere.