Remove Duplicate Lines
Remove repeated lines from a block of text, keeping the first occurrence.
This Remove Duplicate Lines tool scans a block of text and deletes repeated lines, keeping only the first occurrence of each one — useful for cleaning up lists, log files, or exported data with accidental duplicates. Paste your text, click Remove Duplicates, and get the deduplicated result instantly in your browser.
How to use
- 1Paste your text into the input.
- 2Click Remove Duplicates to keep only the first occurrence of each line.
Frequently asked questions
What does this tool consider a "duplicate"?
Two lines with exactly the same content — an exact text match, not a fuzzy or case-insensitive comparison unless the tool's options say otherwise.
When is this useful?
Cleaning an exported contact or email list that has accidental repeats, deduplicating a log file before analysis, or tidying a list pasted from multiple sources.
Which occurrence does it keep — first or last?
The first occurrence of each line is kept, and any later repeats of that exact line are removed.
Does line order change otherwise?
No — remaining lines stay in their original relative order; only the duplicate lines are removed.