Frequently asked questions
Is my list uploaded anywhere?
No. The lines are processed entirely in your browser and are never sent to a server.
How are duplicates decided?
Two lines are duplicates when they match exactly. Turn on Ignore case to treat capitals as the same, and Trim each line to ignore leading and trailing spaces.
Does it keep the order of my list?
Yes, the original order is kept unless you turn on Sort result. With Keep First it keeps the first time each line appears; with Keep Last it keeps the last.
Can it also remove blank lines?
Yes. Turn on Remove blank lines to drop empty lines as well as duplicates.
What is the difference between Keep First and Keep Last?
If the same line appears more than once, Keep First leaves the earliest copy in place and removes later ones, while Keep Last keeps the final copy.
Is there a size limit?
No fixed limit, but very large lists are handled in your browser and may be slower on an older device.