Question 1

How does the duplicate line remover work?

Accepted Answer

Paste multi-line text into the input box and click the process button. The tool automatically identifies and removes duplicate lines, keeping unique ones. Everything runs locally in the browser — no data is uploaded.

Question 2

What is the difference between keeping first and keeping last?

Accepted Answer

Keeping first preserves the first occurrence of each line and removes subsequent duplicates. Keeping last preserves the last occurrence and removes earlier duplicates. Suitable for different use cases.

Question 3

Is deduplication case-sensitive?

Accepted Answer

By default, it is case-sensitive — 'Hello' and 'hello' are treated as different lines. When the ignore case option is enabled, text differing only in case is treated as duplicate.