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How to Remove Duplicate Lines from a List

3 min read · Updated October 2026

Email lists, keyword lists and name lists collect repeats. Removing them avoids double mailing, double counting and wasted time.

Try it now: Remove Duplicate Lines

Free, no sign up, and the file stays on your device.

Open Remove Duplicate Lines

How to remove duplicates

  • Open Remove Duplicate Lines and paste your list.
  • Tick Ignore upper and lower case if Anna and anna should count as one, and choose whether to ignore spaces at the line ends.
  • Copy the cleaned list and note how many lines were removed.

Case and spaces

Anna and anna look the same to a person. If you want them treated as one, ignore case. Extra spaces at the end can also hide duplicates, so run Remove Extra Spaces first.

Keep the order

The first time a line appears it is kept and later repeats are dropped. You can also tick the option to sort the result A to Z.

Frequently asked questions

Can I use it for CSV data?

For whole rows in a CSV file, the CSV Duplicate Remover can compare chosen columns.

Is my text uploaded?

No. Everything happens in your browser, so your text never leaves your device.