What does the Remove Duplicate Lines tool do?
Exported lists: emails, keywords, URLs, IDs: accumulate duplicates fast. This tool removes them while preserving the original order, keeping the first occurrence of each line.
Case-insensitive mode treats “Apple” and “apple” as the same line when you need that.
Frequently asked questions
Which duplicate is kept?
The first occurrence: order is preserved, later repeats are dropped.
Does it trim spaces before comparing?
No: “apple ” and “apple” differ. Run the Whitespace Cleaner first if needed.
How large a list can it handle?
Hundreds of thousands of lines comfortably: it is a single pass in your browser.
Is my list uploaded?
No: deduplication happens locally, which matters for email lists.