Duplicate Line Remover
Strip out repeated lines while keeping the original order.
What is the Duplicate Line Remover?
This tool scans a list of lines and removes any repeats, keeping only the first occurrence of each one and preserving the original order of the list. It is different from a sorter: nothing gets reordered, so the list still reads the way it did before, just without the repeats.
How to use it
- Paste your list into the input box, one entry per line.
- Choose whether matching should ignore letter case, ignore surrounding whitespace, and skip blank lines.
- Click Remove Duplicates and copy the cleaned list.
This is a common task when merging two contact lists, cleaning up an email list before a newsletter send, de-duplicating a list of URLs collected from multiple sources, or tidying data pasted from a spreadsheet where the same row appears twice. The tool tells you how many duplicate lines were found and removed, so you can quickly confirm the cleanup worked as expected. Everything is processed locally in your browser using plain text comparison, so no data is uploaded, which makes it suitable even for lists containing email addresses or other data you would rather not send to a remote server.