HOT
Case Converter
text
Remove Duplicate Lines
Clean repeated lines out of any list - emails, URLs, log entries, code. The first occurrence stays, the rest go, live as you paste. No sign-up, free.
Options
Input
0 words · 0 characters · 0 lines
Output
Runs 100% in your browser No length or usage limits Free, no sign-up
How to remove duplicate lines
Paste your list
One entry per line. Thousands of lines are fine.
Set the matching rules
Case sensitive treats Apple and apple as different. Trim whitespace ignores leading and trailing spaces when comparing.
Copy the cleaned list
The deduplicated output keeps the original order and updates live.
Deduplication questions, answered
Is my text sent to a server?
No. The list is deduplicated in your browser's memory. Email lists, exported customer data and log files never leave your device - worth caring about with exactly this kind of data.
Which duplicate is kept?
The first occurrence, in its original position - the order of your list is preserved.
Are "Apple" and "apple" duplicates?
Your choice. With Case sensitive on they are different lines; off, they merge and the first spelling wins.
What about lines that differ only in spaces?
Turn on Trim whitespace and ' item ' equals 'item' for comparison, while the kept line stays exactly as you pasted it.