Duplicate Line Remover
Paste a list and remove duplicate lines instantly — with sort, trim and case options.
Result will appear here1 lines → 1 kept, 0 removed
About this tool
Got a long list packed with repeats, maybe a column of email addresses, a set of keywords, phone numbers, or data merged from several files? The duplicate line remover cleans it up in seconds. Just paste your multi-line text and it strips out the repeats, leaving you with only the unique lines.
On top of removing identical lines, a few extra options help you get an even cleaner result:
- Trim leading and trailing spaces so lines that differ only by whitespace are still treated as duplicates
- Sort alphabetically to organise the list and make items easy to find
- Drop empty lines you do not need
This is a real time saver for anyone who works with data regularly. Marketers combining contact lists from different sources, spreadsheet users who need a unique set of values, and developers cleaning up a file before importing it all benefit. Instead of scrolling and deleting rows by hand, you let the tool do it in a single pass.
Best of all, removing duplicate lines happens entirely in your own browser. Your data is never sent to a server, so contact lists and customer information stay private. The tool is free, needs no installation and no login, and works the same on mobile or desktop. Paste your list in and watch it come back clean and ready to use, whether you are deduplicating thousands of rows or just tidying a short list.
How to use
- 1Paste your list or multi-line text into the box
- 2Choose options such as trimming whitespace or sorting
- 3The duplicate lines are removed and you can copy the clean result
Frequently asked questions
- How does this tool remove duplicate lines?
- It keeps the first time a line appears and removes every later copy, so each unique line is left only once.
- Can it sort the list too?
- Yes. There is an option to sort lines alphabetically so your list is tidy and easy to scan while duplicates are stripped out.
- Does leading or trailing whitespace affect the comparison?
- If you enable the trim option, spaces at the start and end are removed before comparing, so lines that differ only by whitespace count as duplicates.
- Is my data safe?
- Yes. Everything runs in your browser with no uploading, it is free, and no signup is needed.