Remove duplicate lines
Paste a list and instantly remove repeated lines, keeping the first occurrence of each. You can also keep only the lines that never repeat, or see just the ones that are duplicated. It tells you how many lines it removed.
Processed 100% in your browser
Ctrl + Enter runCtrl + C copy result
How to use
- 1Paste your list or text, one item per line.
- 2Choose what to keep: one of each, only lines that appear once, or only repeated lines.
- 3Adjust the options: ignore case, trim spaces at the start and end, remove empty lines.
- 4Copy the result and check how many lines were removed.
Use cases
- Clean an email or subscriber list that has repeated entries.
- Tidy up duplicate keywords, URLs or references.
- Find which items repeat in a long list.
- Prepare data before importing it into a spreadsheet or database.
Frequently asked questions
Which line is kept when there are repeats?
The first one that appears; later copies are removed and the order of the others does not change.
How does it treat case and spaces?
By default “House” and “house” are different. Turn on “Ignore case” to treat them as equal and “Trim spaces” so “house ” and “house” match.
What is “Only lines that appear once” for?
To keep the truly unique items, discarding everything that appears more than once, including its first occurrence.
Is there a line limit?
There is no fixed limit; it depends on your device’s memory. Lists of tens of thousands of lines process fine.
Is my list sent to a server?
No. Everything is processed in your browser, so it is safe for customer or email lists.