About the Remove Duplicate Lines
Clean up email lists, keyword lists, log files and CSV columns in seconds. The first occurrence of each line is kept, later repeats are removed, and the original order is preserved — unlike sorting-based approaches.
How to use it
- Paste your list or open a text file.
- Choose case sensitivity and whitespace handling.
- Copy or download the de-duplicated list.
Good to know
- Handles hundreds of thousands of lines quickly in the browser.
- For CSV files where only some columns should be compared, use the CSV Duplicate Remover.