How to Use Remove Duplicate Lines
Clean a list by removing repeated lines while preserving order, with options to ignore case and surrounding whitespace.
Open the Remove Duplicate Lines tool →What is Remove Duplicate Lines?
Delete duplicate lines from a list, with optional case-insensitive matching. It's completely free, needs no sign-up, and runs entirely in your browser — so it's fast and private.
How to use Remove Duplicate Lines
- Open the Remove Duplicate Lines tool.
- Paste or type your input.
- Set any options provided.
- Copy the result. Everything runs in your browser — nothing is uploaded.
Frequently asked questions
Does it keep the first or last copy?
It keeps the first occurrence of each line and removes later duplicates, preserving the original order.
Can it ignore case?
Yes — enable case-insensitive matching so lines that differ only in capitalisation count as duplicates.
Is my text private?
Yes — de-duplication runs entirely in your browser.
Ready to try it?
Open Remove Duplicate Lines →