Duplicate Line Remover
Free Online Duplicate Line Remover
Quickly remove duplicate lines from any text. This tool compares each line and keeps only the first occurrence, giving you a clean list of unique lines. Perfect for cleaning up data exports, log files, email lists, or any text with repeated lines.
How to Use
Paste your text into the input area above. Choose whether comparison should be case sensitive and whether leading/trailing whitespace should be trimmed before comparing. Then click "Remove Duplicates". The deduplicated text appears in the output area with stats showing how many lines were removed. Use the Copy button to copy the result.
FAQ
Does it preserve line order?
Yes. The first occurrence of each line is kept in its original position. Only subsequent duplicate lines are removed.
What does "Case sensitive" mean?
When case sensitive is on, "Hello" and "hello" are treated as different lines. Turn it off to treat them as duplicates regardless of capitalization.
What does "Trim whitespace" do?
When enabled, leading and trailing spaces and tabs are stripped from each line before comparison. This means " hello " and "hello" would be considered duplicates.
Are blank lines removed?
Only duplicate blank lines are removed. The first blank line is kept, but any additional blank lines are treated as duplicates and removed.
Is there a size limit?
The tool runs entirely in your browser with no upload to a server, so there is no strict limit. It handles texts with tens of thousands of lines efficiently.