Duplicate Line Remover — Free Online Tool
Remove repeated lines from a list while keeping the original order.
About Duplicate Line Remover
The Duplicate Line Remover scans a list of lines and keeps only the first occurrence of each, deleting every repeat while preserving the original order. It is perfect for cleaning email lists, keyword sets, URLs, CSV columns, and any data where duplicates creep in.
Options let you match case-insensitively, trim surrounding whitespace before comparing, and drop blank lines in one pass. Everything is processed in your browser, so even large lists stay private and there is no upload step or waiting on a server.
How to Use Duplicate Line Remover
- Paste your list into the input box, one item per line.
- Choose options such as case-insensitive matching, trimming, or removing blank lines.
- Click 'Remove Duplicates' to generate a clean, de-duplicated list.
- Use the Copy button to grab the result, or Clear to start over.
Key Features
Removes repeated lines while keeping the original order intact
Optional case-insensitive matching for relaxed de-duplication
Trim whitespace and remove blank lines automatically
Live count showing original lines, unique lines, and how many were removed
Runs entirely in your browser for full privacy
One-click copy and clear, with no limits or signup
Frequently Asked Questions
Does this tool keep the first or last copy of a duplicate?
It keeps the first occurrence of each line and removes any later repeats, so the original order of your list is preserved.
What does case-insensitive matching do?
With it enabled, lines like 'Apple' and 'apple' are treated as the same entry, so only one is kept. Leave it off to treat different capitalization as distinct.
Will it remove blank lines too?
Yes, if you enable 'Remove blank lines'. Otherwise blank lines are treated like any other line during de-duplication.
Is there a limit on how many lines I can clean?
There is no fixed limit. Processing happens locally in your browser, so performance depends only on your device for very large lists.