Removing repeated lines while keeping the original order is something editors do not do directly.
Remove Duplicate Lines keeps the first copy of each line, drops the rest, and reports how many it removed.
How to use Remove Duplicate Lines
- Paste the lines you want to deduplicate into the input box.
- Set trim and case options, and Remove Duplicate Lines keeps the first occurrence of each line in order.
- Copy the deduplicated lines, or download them as a .txt file.
Use cases
- Cleaning a list that has repeated entries.
- Keeping the first copy of each line in order.
- Removing accidental duplicate rows from data.
Good to know
Remove Duplicate Lines walks the list top to bottom, keeps the first time each line appears, and removes later copies, so the original order is preserved. A readout shows how many duplicate lines were removed, and trimming or ignoring case can change what counts as a duplicate.
Frequently asked questions
Which copy of a duplicate is kept?
The first occurrence is kept and every later identical line is removed, so the original order stays intact.
Does trimming affect matching?
Yes. With trim on, lines that differ only by surrounding spaces are treated as the same line.
What does the count show?
It reports the number of duplicate lines that were removed from the list.