Deduplicating a list online should be quick and private, with a clear before-and-after summary.
Online Remove Duplicate Lines processes your lines in the browser and shows how many went in, how many are unique, and how many were removed.
How to use Online Remove Duplicate Lines
- Paste your lines into the input box.
- Adjust trim and case if needed, and Online Remove Duplicate Lines keeps each line's first occurrence and summarises the counts.
- Copy the unique lines, or download them as a text file.
Use cases
- Deduplicating a list privately in the browser.
- Checking how many entries were unique versus repeated.
- Cleaning a pasted list without uploading it.
Good to know
Online Remove Duplicate Lines keeps the first occurrence of each line and removes the rest, all locally in your browser with nothing uploaded. The readout shows the input count, the unique count and how many lines were removed so you can see the effect at a glance.
Frequently asked questions
Is my list uploaded to deduplicate it?
No. The work happens in your browser, so the list never leaves your device.
What do the counts mean?
They show how many lines you pasted, how many are unique, and how many duplicates were removed.
Which duplicate is removed?
Later copies are removed and the first occurrence of each line is kept.