Duplicate Line Remover
Paste a list of lines and remove the duplicates instantly, keeping the first occurrence of each — with optional case-insensitive and whitespace-trimming matching.
Your files are processed locally in your browser. They are not uploaded to our servers.
How to use
- Paste your list into the box, one item per line.
- Turn on Ignore case or Trim whitespace if you need looser matching.
- Click Remove Duplicates, then copy the cleaned-up list.
What is this tool?
Duplicate Line Remover scans a list of lines and removes every repeat, keeping only the first occurrence of each unique line. With Ignore case and Trim whitespace enabled, lines that only differ by capitalization or surrounding spaces are also treated as duplicates. Everything runs locally in your browser.
Common uses
- Cleaning up a mailing list or contact list before use
- Removing repeated entries from a data export
- Deduplicating a list of URLs, tags or keywords
- Tidying up text pasted from multiple sources
Related tools
FAQ
Which line is kept when a duplicate is found?
The first occurrence of each unique line is kept; later repeats are removed.
What does Ignore case do?
It treats lines that differ only in uppercase or lowercase letters as duplicates, e.g. "Apple" and "apple".
Is my list uploaded anywhere?
No. The whole process runs in your browser — your list is never sent to a server.