Does order matter when removing duplicates?

By default, the first occurrence of each line is kept and subsequent duplicates are removed, preserving the original order. Enable the Sort option to sort the output alphabetically after deduplication.

What does trim whitespace do?

When enabled, leading and trailing spaces are stripped from each line before comparing. This means " apple " and "apple" are treated as duplicates. Useful for cleaning up copy-pasted lists.

Can I remove duplicates case-insensitively?

Yes — enable the "Ignore case" option. "Apple" and "apple" will be treated as duplicates. The first occurrence in its original case is kept in the output.

What is this useful for?

Common use cases include cleaning up email lists, deduplicating keyword lists, processing CSV exports, removing repeated log entries, and cleaning user-generated content before processing.

📋

Remove Duplicate Lines

Remove duplicate lines from any text instantly. Sort, trim whitespace, and ignore case. Free online duplicate line remover — no sign-up.

Case sensitiveSort resultTrim whitespace

Input — 1 lines

Output — 1 lines

About This Tool

Paste any list or block of text and remove all duplicate lines instantly. Options to sort alphabetically, trim whitespace before comparing, and ignore case for flexible deduplication.