What does removing duplicate lines do?

It keeps the first occurrence of each line and drops the repeats.

Is my text sent to a server?

No. Deduplication runs in your browser.

You can choose whether lines that differ only in case count as duplicates.

Yes, the first time a line appears sets its position.

Trim your text first if whitespace should be ignored when comparing.

Yes, it is ideal for removing repeats from any line-based list.

去除重复行并保留顺序。

从列表中删除重复行，保留首次出现的顺序。适合清理邮件列表、关键词和日志。

使用方法

常见问题

What does removing duplicate lines do?: It keeps the first occurrence of each line and drops the repeats.
Is my text sent to a server?: No. Deduplication runs in your browser.
Is matching case-sensitive?: You can choose whether lines that differ only in case count as duplicates.
Does it keep the original order?: Yes, the first time a line appears sets its position.
Will leading spaces affect matching?: Trim your text first if whitespace should be ignored when comparing.
Good for cleaning email or keyword lists?: Yes, it is ideal for removing repeats from any line-based list.