Is the comparison case-sensitive?

Yes by default. 'Hello' and 'hello' are treated as different lines.

Does it preserve the order?

Yes. The first occurrence of each line is kept; subsequent duplicates are removed.

What counts as a 'line'?

Each newline-separated string is treated as a line. Empty lines are included unless they are duplicates.

ToolKits

Remove Duplicate Lines

Find and remove repeated lines from any block of text.

Input

Output (deduplicated)

About the Remove Duplicate Lines

Cleaning up lists, log files, CSV exports, or code snippets often means hunting down repeated lines. This tool removes every duplicate, keeping only the first occurrence of each unique line.

How to use the Remove Duplicate Lines

Paste your text (with duplicate lines) into the input.
The deduplicated result appears on the right.
Copy the clean output with the Copy button.

Frequently Asked Questions

Is the comparison case-sensitive?: Yes by default. 'Hello' and 'hello' are treated as different lines.
Does it preserve the order?: Yes. The first occurrence of each line is kept; subsequent duplicates are removed.
What counts as a 'line'?: Each newline-separated string is treated as a line. Empty lines are included unless they are duplicates.