Remove Duplicate Lines

Remove duplicate lines from a list or text, with optional case-insensitive matching and sorting. Everything runs in your browser.

Input

Ignore case Normalize Unicode (NFC) Trim spaces Sort A-Z

Matching locale Blank lines

Keep: First occurrence Last occurrence

Unique lines

Sort lines differently? Text sorter · bulk replace: Find & replace · line diff: Text diff.

Deduplicate line lists

Clean mailing lists, SKU imports and log files — see exactly how many dupes were removed.

Does it keep the original order?

Yes by default. Choose whether the first or last occurrence wins; equal keys keep their original order.

Can I match lines without case differences?

Yes. Ignore case performs a case-insensitive exact line match with the selected locale; it does not apply provider-specific email rules.

Is my text uploaded?

No. Everything runs locally in your browser.

Last updated: 2026-09-09