Remove Duplicate Lines
Paste a list and remove every repeated line in one go. The first occurrence of each line is kept and the original order is preserved.
INPUT
OUTPUT
Runs entirely in your browser. Nothing you enter is sent to a server.
How to remove duplicate lines
Paste the list
Paste email addresses, product codes, keywords or any list with one item per line.
Set the options
Decide whether “Apple” and “apple” count as the same line, and whether spaces at line ends matter.
Copy the clean list
The result shows how many duplicates were removed. Copy it or download it as a text file.
Clean lists before you use them
Duplicate rows in a mailing list mean the same person gets two emails, and duplicates in an import file can cause errors. Removing them first is quicker than fixing the results.
The order stays the same
Lines keep their original order; only later repeats are removed. To sort the list as well, use Sort Lines afterwards.
Frequently asked questions
How many lines can I paste?
There is no fixed limit. Tens of thousands of lines are processed instantly in your browser.
Does it work with spreadsheet data?
Yes, if you paste a single column. For CSV files with several columns, use Remove Duplicate Rows.
Is my list uploaded?
No. Everything happens in your browser.