Duplicate Line Remover
Paste any text and instantly remove duplicate lines. Supports case-sensitive matching, whitespace trimming, and blank line removal.
How to Use
Paste Your Text
Type or paste your text into the input box. Each line is treated as a separate entry — perfect for lists, emails, keywords, or any line-separated data.
Configure Options
Choose whether comparison should be case-sensitive, whether to trim leading and trailing whitespace before comparing, and whether to remove blank lines from the output.
Click Remove Duplicates
Hit the "Remove Duplicates" button to process your text. A stats bar will show how many lines were in the original input, how many duplicates were removed, and how many remain.
Copy or Download the Result
Use the "Copy Output" button to copy the deduplicated text to your clipboard, or click "Download .txt" to save the result as a plain text file.
Frequently Asked Questions
A duplicate line is any line that appears more than once in your text. The tool keeps the first occurrence and removes all subsequent copies. With "Trim whitespace" enabled, lines like " apple " and "apple" are treated as duplicates.
Yes, the "Case sensitive" option is checked by default, meaning "Apple" and "apple" are treated as different lines. Uncheck it to perform case-insensitive comparison, where both would be considered duplicates.
Yes, as long as each row is on its own line. Paste the CSV content into the tool and it will remove any fully duplicate rows. Note that this tool compares entire lines — it does not deduplicate based on a specific CSV column.
By default, blank lines are kept as-is (though duplicate blank lines are removed). If you enable the "Remove blank lines" option, all empty lines — including ones that are blank after trimming — will be stripped from the output entirely.
No. All processing happens entirely in your browser using JavaScript. Your text is never sent to any server, making this tool completely private and safe to use with sensitive data.