Remove Duplicate Lines
Runs in your browser — your data is never uploaded.
Paste a list with repeated entries and get back only the unique lines, in their original order. Choose whether matching is case-sensitive. Handy for cleaning email lists, keyword lists or log files. Everything runs entirely in your browser.
0 characters · runs entirely in your browser
How to use Duplicate Line Remover
- 1
Paste your list into the box, one item per line.
- 2
Choose case-sensitive or case-insensitive matching.
- 3
Click “Remove duplicates”, then copy or download the result.
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Paste this where you want the tool to appear. It runs entirely in your visitor's browser — no uploads, no account, no tracking.
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Frequently asked questions
Which occurrence of a duplicate is kept?+
The first occurrence of each line is kept, in its original position; every later repeat of the same line is removed.
What does case-sensitive matching mean here?+
With case-sensitive matching on, "Apple" and "apple" are treated as different lines. Turn it off to treat them as duplicates regardless of capitalization.
Is my list uploaded anywhere?+
No. De-duplication runs entirely in your browser — nothing is sent to a server, so it’s safe for private lists like email addresses.