Duplicate Line Remover
Remove repeated lines from multi-line text while preserving their first occurrence and original order.
Cleaned Result
How to remove duplicate lines
The tool compares each complete line, not individual words or partial phrases. The first occurrence and input order are preserved.
Example
Project brief reviewed Client meeting at 10 AM tomorrow Project brief reviewed Share the project schedule
Project brief reviewed Client meeting at 10 AM tomorrow Share the project schedule
What counts as the same line
Comparison happens line by line. Case sensitivity decides whether Item and item match, while the surrounding-space option determines whether leading or trailing spaces participate in comparison. The first matching line keeps its original position.
Typical cleanup workflows
This is useful for deduplicating copied IDs, email lists, log entries, tags, or exported rows before importing them elsewhere. Review the output before replacing the source when capitalization or indentation carries meaning.
Frequently Asked Questions
Does the original line order change?
No. The first occurrence of each line remains in its original input order.
Are lines removed when only some words match?
No. A line is removed only when its complete content matches another line under the selected comparison rules.
How are letter case and spaces compared?
Use the case-sensitive and surrounding-space options to control how duplicates are identified.
Does deduplication store the source list?
No. All processing happens in your browser, and neither the input nor result is stored on a server or in a database.